use, but at the same time less perceptible. To discover in the pretended caduceus of Mercury the initial letter of his Greek name riλßwr, one needs only look at the abbreviations in the oldest manuscripts, where they will find that the Σ was once written as C; they will remark also that transcribers, to distinguish this abbreviation still more from the rest, placed the C thus, , and added under it the next letter 7. If those to whom this deduction appears improbable will only take the trouble to look at other Greek abbreviations, they will find many that differ still further from the original letters they express than the present character from the C and r united. It is possible that later transcribers, to whom the origin of this abbreviation was not known, may have endeavoured to give it a greater resemblance to the caduceus of Mercury. In short, it cannot be denied that many other astronomical characters are real symbols, or a kind of proper hieroglyphics, that represent certain attributes or circumstances, like the characters of Aries, Leo, and others quoted by Salmasius. But how old is the present form of these characters? According to Scaliger', they are of great antiquity, because they are to be found on very old gems and rings. If the ring No. 104 in Goræus be old and accurately delineated, this must indeed be true; for some of these characters may be very plainly distinguished on the beazel. We are told by Wallerius that they were certainly used by the ancient Egyptians, because Democritus, who resided five years in Egypt, speaks of them in the plainest terms. I do not know whence Wallerius derived this information, but it proves nothing. He undoubtedly alludes to the laughing philosopher of Abdera, who lived about 450 years before our æra, but no authentic writings of his are now extant. Fabricius says that we have a Latin translation of a work of his, De Arte Sacra, Patavii, 1572, which, however, is certainly a production of In his Annotations on Manilii Astron. Strasb. 1665, 4to, p. 460. In Gorii Thesaurus Gemmarum antiquarum astriferarum, Florent. 1750, 3 vols. fol., I found nothing on this subject. Characters of the moon and of the signs in the zodiac often occur; but no others are to be seen, except in tab. 33, where there is a ring, which has on it the present characters of Mars and Venus. In general the planets are represented by seven small asterisks, or by six and the character of the moon. Besides, the antiquity of this gem cannot be ascertained. much later times. I have it now before me from the library of our university; and I find that it is not the whole book, but only an abstract, and written in so extravagant a manner that the deception is not easily discovered. It contains chemical processes, but nothing of the characters of metals; which is the case also with the letters of Democritus, published by Lubbinus'. [By way of contrast to the seven metals with which the ancients were acquainted, we may enumerate those known at the present day. They are as follows: 1. Gold 2. Silver 3. Iron 4. Copper.. 5. Mercury 6. Lead...... 7. Tin : 27. Cerium D28. Potassium 29. Sodium ... 30. Barium 31. Strontium h32. Calcium... 8. Antimony, Basil Valentine 1490. 9. Bismuth 10. Zinc ... 11. Arsenic...? 12. Cobalt 2 33. Cadmium ... Stromeyer.. 1818. 34. Lithium...... Arfwedson.. 1818. Agricola 1530. 35. Silicium. (Paracelsus?) 1530. 36. Zirconium Brandt...... 1733. 37. Aluminum 38. Glucinum 1741. 39. Yttrium... Cronstedt... 1751. 40. Thorium 15. Manganese.. Gahn ... ... Berzelius... 1824. ...... 1774. 41. Magnesium.. Bussy ... 1829. 16. Tungsten D'Elhujart.. 1781. 42. Vanadium... Sefström 1830. 17. Tellurium ... Müller ...... 1782. 43. Didymium 18. Molybdenum Hjelm 1782. 44. Lanthanium 1 See the collection of Greek letters of Eilh. Lubbinus. Commelin. 1601, 8vo. ZINC. ZINC is one of those metals which were not known to the Greeks', Romans, or Arabians. This we have reason to conjecture, because it has not been distinguished by a chemical character like the rest; but it is fully proved, by our not finding in the works of the ancients any information that appears even to allude to it. I know but of one instance where it is supposed to have been found among remains of antiquity. Grignon pretends that something like it was discovered in the ruins of the ancient Roman city in Champagne. Such an unexpected discovery deserved to have been investigated with the utmost minuteness; but it seems to have been examined only in a very superficial manner; and as that was the case, it is impossible to guess what kind of a metal or metallic mixture this author considered as zinc. It is not surprising that this metal should have remained so long unknown, for it has never yet been found in the metallic state. Its ores are often and in a great degree mixed with foreign ingredients; and when they are melted, it sublimes in a metallic form, and is found adhering above to the cool sides of the furnace; but a particular apparatus is necessary, else the reduced metal partly evaporates, and is partly oxidized, by which means it appears like an earth, and exhibits to the eye no traces of metal. That mixture of zinc and copper called at present brass, tomback, pinchbeck, princes-metal, &c., and which was first discovered by ores, abundant in zinc, yielding when melted not pure copper, but brass, was certainly known to the ancients. Mines that contained ores, from which this goldcoloured metal was produced, were held in the highest estimation; when exhausted, the loss of them was regretted; and it was supposed that the metal would never be again found. In the course of time it was remarked, no one knows by what [It has been observed by an anonymous reviewer (British and Foreign Medical Review, vol. viii. p. 361) that a passage in Strabo authorises the belief that the ancients were acquainted with this metal in its separate state, and that it is the false silver, evdάpyvpov, of that ancient geographer.] Bulletin des fouilles d'une ville Romaine, p. 11. accident, that an ore, which must have been calamine, when added to copper while melting, gave it a yellow colour. This ore was therefore used, though it was not known what metal it contained, in the same manner as oxide of cobalt was employed in colouring glass before mineralogists were acquainted with that metal itself. Aristotle and Strabo speak of an earth of that kind, the use of which in making brass has been retained through every century. Ambrosius, bishop of Milan, in the fourth century; Primasius, bishop of Adrumetum in Africa, in the sixth; and Isidore, bishop of Seville, in the seventh, mention an addition by which copper acquired a gold colour, and which undoubtedly must have been calamine. When in course of time more calamine was discovered, the ancient method of procuring brass from copper-ore that contained zinc was abandoned; and it was found more convenient first to extract from it pure copper, and then to convert it into brass by the addition of calamine. Those desirous of inquiring further into the knowledge which the ancients had of this metal must examine the meaning of the word cadmia, which seems to have had various significations. This task I have ventured to undertake; and though I cannot clear up everything that occurs respecting it, I shall lay before my readers what information I have been able to obtain on the subject, because perhaps it may amount to somewhat more than is to be found in the works of old commentators. Cadmia signified, then, in the first place, a mineral abounding in zinc, as well as any ore combined with it, and also that zinc-earth which we call calamine. Those who should understand under it only the latter, would not be able to explain the greater part of the passages in the ancients where it is mentioned. It is probable that ore containing zinc acquired this name, because it first produced brass'. When it was afterwards remarked that calamine gave to copper a yellow colour, the same name was conferred on it also. It appears, however, that it was seldom found by the ancients; and we must consider cadmia in general as signi1 Plin. lib. xxxiv. sect. 22. 2 Zinc-ore, besides being mentioned by Aristotle and Strabo, is mentioned by Galen, De Simplic. Medicam. Facultatibus, lib. ix. p. 142. As he found no furnace-calamine when he resided in Cyprus, he procured from the overseer of the mines some raw cadmia, which had been found in the mountains and rivulets, and which certainly must have been calamine. VOL. II. D fying ore that contained zinc. Gold-coloured copper or brass was long preferred to pure or common copper, and thought to be more beautiful the nearer it approached to the best aurichalcum. Brass therefore was supposed to be a more valuable kind of copper; and on this account Pliny says that cadmia was necessary for procuring copper, that is brass. Copper, as well as brass, was for a great length of time called æs, and it was not till a late period that mineralogists, in order to distinguish them, gave the name of cuprum to the former'. Pliny says that it was good when a large quantity of cadmia had been added to it, because it not only rendered the colour more beautiful, but increased the weight. In the like manner a quintal of copper in Hungary produces a hundred and fifty pounds of brass. The same author remarks also that the cadmia (fossilis) was not used in medicine: this however is to be understood only of the raw ore, for some physicians prepared oxide of zinc from ore that contained zinc, as he afterwards tells us; and Galen extols the calamine found in Cyprus on account of its superior effects, because, perhaps, the oxide could be obtained from it much purer. In the second place, cadmia, among the ancients, was what we call (ofenbruch) furnace-calamine, or what in melting ore that contains zinc, or in making brass, falls to the bottom of 1 At first it was called as cyprium, but in the course of time only cyprium; from which was at length formed cuprum. It cannot however be ascertained at what periods these appellations were common. The epithet cupreus occurs in manuscripts of Pliny and Palladius; but one cannot say whether later transcribers may not have changed cyprius into cupreus, with which they were perhaps better acquainted. The oldest writer who uses the word cuprum is Spartian; who says, in the Life of Caracalla, "cancelli ex ære vel cupro." But may not the last word have been added to the text as a gloss? Pliny, book xxxvi. 26, says, "Addito cyprio et nitro;" which Isidore, xvi. 15. p. 393. expresses by the words adjecto cupro et nitro. The superiority of the Cyprian copper gave occasion to this appellation; as the best iron or steel was called chalybs, from the Chalybes (a people of Galatia), who prepared the finest, and carried on the greatest trade with it. But in what did the superiority of this Cyprian copper consist? In its purity, or in its colour, which approached near to that of gold? That island produced a great deal of ore which contained zincs and abounded also with calamine. Pliny says, " in Cypro prima fuit æri, inventio." Red copper however had been known there from the earliest periods, so that the honour of its invention must be allowed to that island without any contradiction; and Pliny must undoubtedly allude in the above passage to some particular kind. |