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SIGNATURE-SIGNET.

may become an amateur signalman on emergency. A secret code, in which the same numbers have different significations, could always be maintained for state purposes.

cones.

It only remains to apply the same system to night-signals. The old naval principle has been to hang dingy lanterns in various shapes-triangles, Besides requiring large squares, crosses, &c. bases to be at all visible, this has been found from the motion of a ship to be nearly useless. Redl's system has been applied by hanging four lanterns in a vertical line to represent the cones, and obscuring those which corresponded to shut An improvement was found in introducing a red or green light in the middle, to shew the relative position of the four. The best night-signals are, however, flashing lights, as introduced by Captain Bolton, and more elaborately by Lieutenant Colomb, and adopted in the navy. This consists of a bright light, covered by a shade, which shade, by mechanism, can be lifted for any given time, exposing the light meanwhile. A flash of about half a second's duration is negative: a line of 1 seconds, positive. Four exhibitions of the light then represent a symbol as in Redl's cones. If the same nomenclature

MAJOR.

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within a mile or so, and the weather still, a bugle will answer equally well, long and short notes representing the positive and negative cones.

The fundamental principle of the foregoing system of universal telegraphy, applicable by night or by day, by sight or by sound, is to employ two signals only-one positive and one negative-and to regulate their exhibition by periods of time.

SIGNATURE, in Music. In writing music in any key with sharps or flats, the sharps and flats belonging to the key, instead of being prefixed to each note as required, are placed together immediately after the clef on the degrees of the staff to which they belong; and this collection of sharps or flats is called the signature. The signatures of the several keys generally in use are as follows:

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from B major to B minor:

the sharps which are to continue being, in this last case, for distinctness' sake, appended in addition to the contradiction of those that are to be discarded. A transition to another key, which is not to continue for any length of time, is seldom indicated by a change of signature; but the sharp, flat, or natural sign is appended to any note as required, that sign affecting all the following notes of the same letter in the measure in which it occurs, unless contradicted. A sharp, flat, or natural thus introduced is called an accidental. Two accidentals are required in the ascending scale of every minor key, to sharpen the sixth and seventh of the tonic.

Besides the signature of the key, a signature of time precedes every musical composition. It consists of two figures placed over one another as a fraction, the denominator 2, 4, 8, or 16 standing for minims, crotchets, quavers, or semiquavers (i. e., halves, fourths, &c. of a semibreve), while the numerator points out how many of these fractional parts of a semibreve are contained in each measure.

and

three quavers, in the measure. there are four crotchets (or a semibreve) in the 4 4

measure, it is usual to write instead of

SIGNATURE, in Printing, denotes the letters which are placed at the bottom of the first page of each sheet of a book, to facilitate the arrangement of the several sheets in the volume. The letters employed are those of the alphabet, with the excep tion of J, V, and W, three letters which have been invented since the use of signatures was introduced. See ALPHABET. As the first sheet of a work, containing the title-page, dedication, preface, &c., is generally printed last, the letter A is reserved (along with small letters, a, b, &c., should there be more sheets of introductory matter) for this, and the signatures commence with B; after reaching Z, they commence again at the beginning of the alphabet, the letter being doubled for the sake of distinction, as AA, or Aa, or more frequently 2A. Should the alphabet again be exhausted, 3A, 3B, &c., are next This is the method employed employed, and so on. in Britain; in France and Italy, figures are generally used. Signatures (as B2, B3, &c.) are also placed on certain pages of the same sheet, as a further direction to the bookbinder.

SIGNET, in England, one of the seals for the authentication of royal grants. Prior to 1848, all letters-patent and other documents which had to

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SIGNING, SEALING, AND DELIVERY-SIKHS.

pass the Privy Seal, required first to have the signet affixed, and passed from the Signet-office to the office of the Privy Seal in the form of signet bills, verified by the signet-seal and superscription and the signature of the Clerk of the Signet. By act 11 and 12 Vict. c. 82, however, warrants under the royal sign-manual, countersigned by one of the principal secretaries of state, have been made per se sufficient authority for the Privy Seal to be affixed, and the Signet-office has been abolished. The signet in Scotland is a seal which seems to have been originally intended to authenticate royal warrants connected with the administration of justice. The principal class of agents or attorneys in Scotland are called Writers to the Signet, it is said from their having been originally clerks in the office of the Secretary of State, by whom writs passing the signet were prepared. See WRITERS TO THE SIGNET.

SIGNING, SEALING, and DELIVERY of a deed, in English Law, is the mode of executing a deed. The main acts are, however, the sealing and delivery, for signature is not absolutely essentialat least in some kinds of deeds known to English law. The use of the seal is an ancient form of authenticating deeds, still kept up in England, though long superseded in Scotland by simple subscription. In practice, a wafer or seal is attached to the end of the English deed, and the party who executes it must, after signature, put his finger on the seal, and say: 'I deliver this as my act and deed,' at the same time handing the deed to the person who is to have the custody thereof.

SIGN-MANUAL, ROYAL, the subscription of the sovereign, which must be adhibited to all writs which have to pass the Privy Seal or Great Seal. When attached to a grant or warrant, it must be countersigned by one of the principal secretaries of state, or by the Lords of the Treasury. The signmanual, in practice, consists but of the initial of the sovereign's name, with the letter R added, for Rex or Regina.

SIGOURNEY, MRS LYDIA HUNTLEY (Huntley being her maiden name), American authoress and poet, was born at Norwich, Connecticut, in 1791. She was, like most young ladies of ability in New England at that period, early engaged in teaching, and much of her early writings consist of tales, essays, instructive letters, and poems, for her pupils and the young. Her first published work was a volume of poems in 1815. In 1819, she was married to Mr Charles Sigourney, a merchant of Hartford. In 1822, she published a descriptive poem on the Traits of the Aborigines of America; and in 1824, a Sketch of Connecticut Forty Years Since. These were followed by Pocahontas and other Poems, Lays of the Heart, Tales in Prose and Verse, &c. In 1840, Mrs S. visited Europe, and on her return, with a freedom common to American authors, wrote her Pleasant Memories of Pleasant Lands. She compiled amusing and instructive books for the young, and was a constant contributor to magazines and other periodicals of poems, whose subjects, style, and sentiment gave her the designation of the American Hemans.' She died at Hartford, June 1865.

SIHU'N. See JAXARTES.

SIKHS. The term Sikh, a corruption of the Sanscrit s'ishya, signifying 'disciple,' is applied to a community of which the Punjab, in Northern India, constitutes, substantially, the confines. Less commonly, even among themselves, the members of this community are also known as Sinhs (vulgarly Singhs), that is, lions,' a title given them by Govind, the last and most influential of their hierarchs. Every

name of a Sikh male now terminates with the word Sinh.

Originally a body of mere religionists, the Sikhs, what from the energy which they developed under repression, and the inducements to join them which they offered as proselytisers, grew, by degrees, in strength and numbers, and ended in a formidable nationality. Their originator, Nanak, was born in 1469, in the vicinity of Lahore, and died in 1539, not far from the place of his nativity. To him succeeded, in turn, nine pontiffs, each of whom, like himself, is popularly denominated guru, or 'teacher.' These were Angad, Amardâs, Râmdâs, Arjunmall, Hargovind, Harrây, Harkrishna, Teghbahâdar, and, finally, Govind.

The aim of Nanak was pointedly humanitarian, and designed to combine Hindus and Mohammedans, at the cost of what he held to be only brotherhood. Sufficient proof of the comprehensive unimportant compromise, into one harmonious character of his scheme is afforded by the circumstance that he accepted concurrently the incarnations of Neo-Brahmanism and the mission of the Arabian prophet. His three immediate successors, while avoided secular pursuits, and held themselves aloof zealously protecting the interests of the infant sect, from political complications. Arjunmall, however, not content with signalising himself as compiler of the Adigranth, and as founder of Araritsar, the holy city of the S., engaged with ardour in trade, and rendered himself conspicuous as a partisan of the rebellious Prince Khusrû, son of Jahangir. Hararms, led them in person to battle, and, though he govind, who came after Arjunmall, called the S. to remitted nothing of his assiduity as a guru, became an active and useful, though sometimes refractory, adherent of the Great Moghul, against whom his predecessor had plotted. Harray subsequently espoused the part of Dârâ Shukoh, when contending with his brothers for the throne of India. Harkrishna, son of Harray, died a child, and was only nominally a guru. Teghbahâdar, after a career of turbulence, was executed as a rebel, by command of Aurangzeb, at Delhi. However deficient in the qualifications demanded for spiritual leadership, it can scarcely be doubted that he contributed, to an important degree, in preparing for the complete change of Sikhism which was effected by his son, Govind. The chief motive that instigated Govind, the tenth of the teachers,' to bring about this change was, with some probability, a desire to avenge the ignominious death of his father. He resolved to combat the Mohammedan power and, in deviation from the principles enunciated by Nanak, the Mohammedan religion as well. But Hinduism, with its social restrictions of caste, its fantastic fictions, and its irrational idolatry, likewise fell under his ban. God, he inculcated, is not to be found save in humility and sincerity. In what measure he was a man of thought is evinced by his legacy to his co-religionists, the second volume of the Sikh scriptures. A Sikh, it is therein taught, is to worship one God, to eschew superstition, and to practise strict morality, but equally is to live by the sword. The purport of this last injunction is unmistakable. Govind was assassinated, while in the imperial service, in 1708, on the banks of the Godavari. He died, it is true, without beholding the fulfilment of the purpose for which he had striven; but he had, nevertheless, succeeded in stirring his followers to an ambition for political independence-an idea which was ultimately transformed into a reality. His successor, but only as a temporal leader, Banda, suffered a cruel death. He did but little to advan tage his sect; and his memory is not held in reverence.

SIKHS-SIKH WARS.

With the decline of the Moghul Empire, the might of the S., in spite of their intermittent reverses, steadily increased, until, in 1764, they convened a general assembly, formally assumed the character of a substantive nation, and issued coin from which the name of the emperor was omitted. Their commonwealth was still denominated, as it had been by Govind, Khalsa; and the component states of the federation, ordinarily said to have been twelve in number, were thenceforward distinguished as Misls. Foremost in influence among these states was that of Sukarchakiya, the chieftain of which was Maha Sinh, for whose son, the famous Ranjit Sinh (Runjeet-Singh, q. v.), it was reserved to consolidate the Misls into a unity subject to his own undivided control. The virtual headship of Ranjit Sinh dates from the year 1805, though it was not until 1838 that he attained the zenith of his ascendency. He died in the year following, at the age of 59. During 1845 and 1846, the S. ceased to exist as a nation; and their country has since been ruled by the English. Yet every loyal Sikh is still confident that his people is suffering but a transitory depression, and that it is destined to retrieve, and even to surpass, its bygone glory. In the meantime, the reputed son of a wife or concubine of Ranjit Sinh, Dilip Sinh, is a pensioner of the British government, has professed Christianity, and has taken up his abode in England.

Ethnologically considered, the S. are, in large proportion, of Jat origin; the Jâts, whom some take to be one with the classical Getæ, being a tribe extensively diffused over the north of India. But other Hindus have helped to swell their ranks, and also not a few Mohammedans. The ten gurus are accounted Kshatriyas, or of the second Brahmanical caste, the martial. The descendants of these several races, from intermarriage and other causes, cannot, however, now be discriminated; and there is no division of the multiform population of India that strikes more than the S., as respects physical uniformity. For symmetry and comeliness, and, it may be added, for courage and powers of endurance, the Lions of the Punjab are altogether remarkable. Nanak's was, undoubtedly, by far the most successful of the repeated attempts which have been made to fuse together the incompatible dogmas of Hinduism and Islamism. None of the authors of these attempts seem, indeed, to have been acquainted with other than the mere surface of the two religions which they would have blended into one. With the Mohammedan, the existence of the Deity as a pure spirit, and his creatorship of the world, are fundamental postulates. On the other hand, the radical doctrine of the Hindu is pantheism, agreeably to which the universe, alternatively God, is a single eternal substance, under the twofold aspect of spirit and matter. These sets of first principles, which Nanak and his fellow-reformers could never have clearly apprehended, are palpably impossible of reconciliation. Without rejecting all that is distinctive of his creed, no Hindu can assent to the theology of Islam; and, conversely, every intelligent follower of the Arabian prophet must be aware that the monism and the metempsychosis of Brahmanism are utterly antagonistic to the leading positions of his own faith. Govind, as we have seen, openly repudiated the notion of amalgamating Hinduism and Mohammedanism. But a critical acquaintance with his real views, in their fulness, and of those of Nanak, must remain a matter of conjecture until we possess a detailed translation, executed by some scholar competently versed in Hindu philosophy, of the Adigranth (The Original Record) and the Daswin Pâtsâhî da Granth (The Record of the Tenth King). These voluminous

compositions are metrical throughout, and are chiefly in Hindi and Panjâbî; the former containing, additionally, a little Sanscrit, and the latter, a long chapter in Persian. They are written in the same character as the Sanscrit, the values of the letters being altered, though their forms are retained. Among the numerous divisions into which Sikhism, as a system of belief and practice, has ramified, two, at least, apart from the great central sect, deserve specification. First are the Udâsis, professors of indifference to mundane concerns; a sect whose origin is attributed to S'richand, a son of Nânak. These recluses, whom Amardâs refused to recognise as genuine S., have, to this day, numerous disciples. The Akalis sprang up just after the time of Govind. For extravagance of fanaticism, these Ishmaelites have, it is hoped, no rivals; and the style of their piety is comparable with that of a Thug.

As specimens of the superstitions of the S., it may be noted that, like the Hindus, they look upon the eating of beef as a deadly offence, and that, like the modern followers of Zoroaster, they attach sinfulness to the act of extinguishing a light with the breath. Some illustrations of practical Sikhism may also be gathered even from the few remarks that have been made touching the gurus. It is not irrelevant to add, that Amardâs humanely discountenanced the cremation of widows, and that Arjunmall committed suicide. The morality of ordinary S. is as positively maintained by one class of writers as it is denied by another. Evidence should seem to shew that the agriculturists among them are much on a par, as to correctness of life, with other Indian cultivators of the soil. As to their soldiers, however, it has been observed that they are deeply tainted with those repulsive impurities for which the Persians are so infamous. Though forbidden the use of tobacco, they are under no restriction as concerns indulgence in bhang, opium, and intoxicating drinks; and it would be gross flattery to commend them on the score of sobriety. As regards morality, there is reason to believe that they have greatly degenerated since the days of Govind.

The gross Sikh population has been most variously estimated by different statisticians, some of whom compute it at considerably less than half a million of persons, while others deem a million and a quarter, or even a million and a half, to be not excessive.

For the most satisfactory extant treatment of the subject of this article, the reader is referred to Captain J. D. Cunningham's History of the Sikhs. Sir J. Malcolm's Sketch of the Sikhs; The Asiatic Researches, vols. i. and xi.; the collective works of Professor H. H. Wilson, vols. i. and ii.; and The Calcutta Review, vols. xxxi. and xxxiii., may likewise be consulted with advantage.

SIKH WARS, two brief but desperate contests waged between the British power in India and the the destruction of the latter as an independent nation. Sikhs in 1845-1846, 1848-1849, which resulted in The first had its origin in the dissensions which convulsed the Sikh country after the death of Runjeet Singh (q. v.), and which necessitated the exercise of a wary regard on the part of the Calcutta authorities. At length an army of Sikhs, flushed with their triumph over all lawful authority in their own country, crossed the Sutlej, and but their advanced guard was met by Sir Henry extended their ravages over British territory; Hardinge, the governor-general, at the head of four regiments of infantry and one of dragoons, and routed at Mudki (q.v.) with heavy loss. Three days after, their main body, which had meantime crossed the river, and intrenched itself at Feroze

SI-KIANG-SILESIA.

Shah (q. v.), was attacked by a larger force of British under Gough and Hardinge, and after a bloody conflict, which lasted two days, also routed. Still undismayed by these reverses, they again intrenched themselves at Sobraon; but a fresh body which had just crossed the Sutlej at Aliwal (q. v.), 19,000 strong, with 68 pieces of cannon, was wholly routed and driven across the river by Sir Harry Smith, at the head of 7000 men, with 32 guns; and their main body was soon after similarly dispersed at Sobraon (q. v.). The British then crossed the river, took Lahore, and restored the authority of the young Maharajah, from whom they took the territory between the Beas and the Sutlej, the treaty confirming this settlement being made at Lahore, 9th March 1846. But the internal disturbances in the kingdom of Lahore soon became as active as before, and induced the Maharajah's prime-minister to put the country under the Company's protection; and a residency with a guard of regular troops was then established in the capital. On April 20, 1848, two British officers were murdered by a Sikh chief, the dewan Moolraj of Multan; and as this was found to be but a premonitory symptom of a general outbreak, a small force of British under Lieutenant Edwardes, aided by a body of Sikhs, under the Rajah of Bhawalpur, gallantly attacked the army of Moolraj, which, after a desperate conflict of nine hours, they defeated on June 18, and, both sides in the meantime having received reinforcements, again on July 1. Multan was then laid siege to, but the defection of 5000 auxiliary Sikhs under Shere Singh (the son of the Sirdar Chuttur Singh, the governor of Hazara, who had been for some time in revolt, and had driven the British from his district) compelled the British to retreat. For some time, the British authorities in the Punjab were hampered by a want of military force, and though the Maharajah and much of his army still opposed the Sikh rebels, little reliance could be placed upon most of it. Shere Singh now succeeded in raising his army to 40,000, but was defeated by Lord Gough at Ramnugger (November 22). The inconsiderate haste of Gough at Chillianwalla (January 13) nearly lost him that great battle, which was saved only by the extreme valour of his soldiers; but amends for this fault was made at Gujerat (q. v.), where the power of Shere Singh and his allies was completely broken. Meanwhile, the fortress of Multan had, after a protracted bombardment, been captured; and the Company, seeing no other mode of protecting their territories from annoyance by these warlike fanatics, annexed the Punjab, March 29, 1849, thus terminating the existence of the Sikhs as an independent nation.

SI-KIA'NG, or WESTERN RIVER, a river at the southern extremity of China Proper. It has lately been ascertained by our surveyors to be navigable for vessels not drawing more than 16 feet of water for about 100 miles from its mouth. The S. is remarkable for the purity and clearness of its waters. It is at present chiefly useful in conveying the sugar-cane that grows in its vicinity, as well as rafts of timber from the forests of Kwangse,

to the markets of Canton.

SI'KKIM, a small protected state in the northeast of India, bounded on the W. by Nepaul, and on the S.-E. by Bhotan. Area, 1670 sq. m.; pop. 61,766.

SILE'NÉ, a genus of plants of the natural order Caryophyllaceae; with a tubular 5-toothed calyx; five notched or bifid petals, which terminate in a narrow claw at the base, spring from the stalk of the germen, and have each an appendage forming a Corona (q. v.) in the mouth of the corolla; ten

stamens ; three styles; the capsule 3-celled, 6-toothed, many-seeded. The species are numer ous, mostly natives of the temperate parts of the northern hemisphere, annual and perennial plants; nine or ten of them natives of Britain, and others frequent in flower-gardens.-One of the most common British species is the BLADDER CAMPION (S. inflata), a perennial, which grows in cornfields and dry pastures, and near the sea-shore, has a branched stem fully a foot high, ovate-lanceolate bluish-green leaves, panicles of white flowers, and an inflated calyx, with a beautiful network of veins. The young shoots are sometimes used like asparagus, and have a peculiar but agreeable flavour, somewhat resembling that of peas. They are best when most blanched. The cultivation of this plant was long ago strongly recommended, but it has not obtained a place among garden plants.-The Moss CAMPION (S. acaulis) is a pretty little plant, with beautiful purple flowers growing in patches so as to form a kind of turf, one of the finest ornaments of the higher mountains of Scotland, and found also in Cumberland and Wales.-Many species, some of them British, are popularly called CATCHFLY, from their viscidity, as S. Anglica, a species found in sandy and gravelly fields in many parts of Britain.

SILE'NUS, son of Pan and Gæa (the Earth), is generally represented as the chief of the Sileni or older Satyrs (q. v.), and the inseparable companion of Bacchus, with whom he took part in the_contest against the Gigantes, slaying Enceladus. In most respects, he seems to have resembled the other satyrs, and to have borne a strong likeness to Sir J. Falstaff, being in addition noted for his wisdom and his power of prophecy. S. had a temple at Elis.

SILE'SIA, a province of the kingdom of Prussia, included in the limits of the Germanic Confederation, lies south of the provinces of Brandenburg and Posen, and is bounded on the E. by the Polish provinces of Russia and Austria, and on the S. and W. by the Austro-Germanic provinces, and the kingdom of Saxony. It is divided into three governments: Liegnitz, in the west; Breslau, in the east, and Oppeln, in the south; and these, again, are subdivided into circles. Total area, 15,547 English sq. m., with a pop. (1861) of 3,390,695, of whom 1,674,724 are Catholics, 1,670,317 Protestants, and 41,100 Jews. Of the population, th speak Polish, more than 90,000 employ other Slavic dialects, and the rest use the German language. This province, by far the largest and most populous of the Prussian provinces, is crossed from north-east to south-west by a broad strip of mountainous country, which widens out at each extremity; and along the whole eastern boundary, and in the south, are ranges of low hills; in the north-west and centre, the surface is flat and heathy, or sandy, with numerous stagnant pools. S. is almost wholly included in the basin of the Oder (navigable as far south as Ratibor), which flows through it from south-east to northwest, and receives from each side numerous tributaries; but a small portion in the extreme south is drained into the Vistula, which here takes its rise. The soil is altogether fertile and well cultivated, cereals of all kinds, oil-plants, beet, hops, occa more so, however, in Lower than in Upper S.; and sionally vines, and above all, flax and hemp, are the crops of the province; but of late years the cultivation of tobacco, and of plants yielding dyestuffs, has been receiving increased attention. Cattle and sheep, the latter excellent in quality, and partly of pure or mixed merino blood, are reared in the high-lands, the annual produce of wool averaging fully 140,000 cwt. The mines of S. are of great importance; iron, copper, and lead are the chief

SILESIA-SILICON.

products; coal is found in abundance. The manufacture of lace, averaging in annual value £1,500,000, is carried on in the mountainous districts, chiefly around Schweidnitz; and the production of other fabrics, as linen, cotton and woollen goods, paper, iron, leather, glass, and earthenware, is vigorously carried on throughout the province. The Oder, and the great central railway from Berlin and Posen to Vienna, afford ample facilities for commerce. There are a university at Breslau, gymnasia in the principal towns, and a great number of professional and industrial schools.

In

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SILHOUETTE, the name given to a profile or shadow-outline of the human figure, filled in of a dark colour, the shadows and extreme depths being sometimes indicated by the heightening effect of gum or some other shining material. species of design was known among the ancients, and was by them carried to a high degree of perfection, as the monochromes on Etruscan vases amply testify; but the name S. is quite modern, dating from about the middle of last century. It was taken from Etienne de Silhouette, the French

S. was inhabited at the beginning of the Christian era by the Quadi and Lygii, who, like the other German tribes, advancing westward in the 6th c., were succeeded by Slavic tribes. It formed part of the Slavic kingdom of Moravia, was next joined to Bohemia, and in the beginning of the 10th c. to Poland. In 1163, it was separated from the kingdom of Poland, but was ruled by dukes who were of the royal line of Piast; these dukes, to repeople the country, which had been devastated by the numerous civil wars, encouraged the settlement of German colonies, especially in Lower Silesia. The practice of division and subdivision of territory prevailed so extensively in S., that at one time it had no less than 17 independent dukes, and to save itself from re-incorporation with Poland, it acknowledged the sovereignty of the kings of Bohemia, with which, and with Germany, from the time of the Emperor Karl IV., it was indissolubly connected. 1537, the Duke of Liegnitz, one of the numerous Silesian princes, entered into an agreement of mutual succession (Erbverbrüderung) with the Elector of Brandenburg, on the extinction of either reigning line; and the other ducal lines becoming gradually extinct, their possessions fell to Liegnitz or to Bohemia, or lapsed to the emperor. In 1675, when the last ducal family, that of Liegnitz, failed, his territories of Liegnitz, Brieg, and Wohlau, would minister of finance in 1759, who, to replenish the have fallen to Prussia, but the emperor of Germany treasury, exhausted by the costly wars with Britain refused to recognise the validity of the agreement of and Prussia, and by excessive prodigalities, inaugu1537, and took possession of the Liegnitz duke's rated numerous reforms, and the strictest economy dominions, as a lapsed fief of Bohemia. The remain- of expenditure. His extreme parsimony in all der of S. was thus incorporated into the Austrian finance matters made him a choice subject for cariempire. In 1740, Frederick II. of Prussia, taking cature; so that any mode or fashion that was plain advantage of the helpless condition of Maria Theresa and cheap-surtouts' without plaits, trousers withof Austria, laid claim, on the strength of the agree-out pockets-was styled à la Silhouette; and ment of 1537, to certain portions of S.; and without declaring war, marched into, and took possession of the province, maintaining his hold despite the utmost efforts of Austria in 1740-1742, and 1744 1745, called the first and second Silesian wars. After the third Silesian war, better known as the SEVEN YEARS' WAR (q. v.), it was finally ceded (1763) to

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Prussia.

Silhouette of Robert Burns.

profiles made by tracing the shadow projected by the light of a candle on a sheet of white paper being then much in vogue, have continued to bear the name. Although without merit as a work of art, the S. presents a clear and well-marked profile, and such instruments as the Pantograph (q. v.), &c., used to be frequently employed to obtain profiles of a reduced size direct from the human features.-Profiles cut out of black paper with scissors also receive the name of silhouettes.

SI'LICA. See SILICON.

elements.

SILICON, or SILI'CIUM (sym. Si, eq. 14, spec. grav. 2:49), is one of the metalloids, or non-metallic It may be obtained in three different forms or modifications-viz., the amorphous, the graphitoid, and the crystalline. It is the first of the processes in common use, the second and third these, the amorphous silicon, which is obtained by being obtained from this first modification.

SILESIA, AUSTRIAN, a duchy and crownland of the Austrian empire, bounded on the N.-E. by Prussia, and on the S.-W. by Moravia. Area, 1963 sq. m.; pop. (1857) 443,912. It is mountainous in the west, where the Spieglitzer Schneeberge, a summit of the Sudetic chain, rises to the height of 4512 feet. The crownland comprises 1806 sq. m. of level land, of which by far the greater portion is arable or under wood. The climate, though rough, is healthy, and the soil produces good crops of rye, oats, barley, flax, &c. Within the crownland rise the Oder and Vistula. Cattle-breeding and bee-Amorphous silicon presents the appearance of a keeping are important branches of industry; 170,000 head of sheep belong to the crownland. Iron, lead, and coal mining are profitably pursued. The manufactures are principally spirits, copper and iron wares,

and linen and cotton fabrics.

SI'LEX (Lat. flint), a generic name given by some mineralogists to all those minerals of

dull brown powder, which adheres to the finger, is but readily soluble in hydrofluoric acid, and in a insoluble in water and in nitric and sulphuric acids, electricity, and when heated in air or oxygen, its hot solution of potash. It is a non-conductor of external surface burns brilliantly, and is converted into silica, which fuses from the extreme heat, and forms a coating over the unburned silicon. Graphitoid

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