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ble of sustaining a successful competition with linseed cake itself, and not more than two-thirds the market value of the latter, it now only remained to prove that its practical answered to its theoretic value. Of this there did not appear to me to be any serious doubt; nevertheless I thought it bettor to put the matter to the test of practical experiment. A friend to whom I named the subject readily entered into the plan of trying the effect of this cake upon a portion of his stock; the result proved his cattle would eat it with eagerness, and, as far as the experiment has gone, it has answered our highest expectations.

On a Simple Method of talcing Sttreomicro-photographs. By Chables Hkisch, F.C.S., Lecturer on Chemistry at the Middlesex Hospital.

After trying various plans, the author devised the following, which answered perfectly. A microscope with its eyepiece removed is placed in a horizontal position, and fitted to an ordinary sliding back, single lens, stereoscopic camera. Behind the object-glass is screwed an adapter, in the inside of which is a tube, which can bo turned half round by means of a lever from the outside. Sliding in this tube is a second, furnished with a stop which cuts off half the pencil of light coming from the object-glass, in fact occupies the same place as the prism of a binocular microscope. The distance of this stop from each object-glass is adjusted experimentally Dy sliding the tube backwards and forwards till the best effect is obtained. The prepared plate beinjr put in its place after carefully focusing the object, the first picture is taken. The plate is then shifted, the stop turned half round, and the second picture taken on the other half of the plate. If the object be of any thickness, its upper surface should be focused for one picture, and its under surface for the other.

The adapter with its stop was exhibited to the meeting.

Lowe's Ozone Box. By E. J. Lows, F.R.A.S. $c. This box has been constructed so as to ensure perfect darkness to the test-paper ■without interfering with the passage of a current of air. There are two openings into this cylindrical box, the one above and the other below. These openings are not direct into the box itself, but into narrow winding passages in the first instance; they are also opposite each other. If the wind is blowing in an easterly current, and the upper opening is on the east side, then the air will enter the box on the

Fig. 1. Fig. 2.


upper half (fig. 1), will move round the circular passage until it enters the central cavity (A) where the test-paper is hung, afterwards passing round the lower passage (fig. 2) in a contrary direction, and out again at the west aperture. Or if the wind happens to be in the opposite direction, it will enter from below and leave the box from above. The advantage is obvious—a current of air passes through a dark chamber. The box is small, and its price almost nominal.

Observations on Ozone. By E. J. Lowe, F.R.A.S. fc.

The following are results of observations made at the Beeston Observatory during the past four years:—

1st. If the temperature is raised, the amount of ozone will increase.

2nd. If the current of air through the box increases in rapidity, the amount of ozone will increase.

d it ions of the atmosphere. By the catalytic action of phosphorus on atmospheric air, a gaseous body (superoxide of hydrogen) is formed, which is analogous to. if not the same as, atmospheric ozone, and it can be detected by the same tests. The author has found, by his usual tests, that phosphoric ozone is developed only when the phosphorus is luminous.

On Ferrous Acid. By W. Odling, M.B., F.B.S. The author found that when ferric oxide was ignited with the carbonates of potassium, sodium, and calcium, each atom of fea ©s drove out one of CO,, to form two atoms of an alkaline ferrite, having the general formula M fe 0„ which salts were decomposed by water into caustic alkali and ferric monohydrate or brown hasmatite; thus, M fe 0J+HaO=HfeOa+MII0.

On the Synthesis of some Hydrocarbons. By "W. Odling, M.B., FJIJS. The author found, in particular, that when a mixture of carbonic oxide and marshgas was passed through a red-hot tube, acetylene was abundantly formed according to the equation CO+GH4=CaH„+HaO.

On the Nomenclature of Organic Compounds. By "v7. Odlhtg, M.B., F.R.S.

Admitting the impossibility of establishing a thoroughly systematic nomenclature in organic chemistry, the author advocated a gradual improvement of that now in more or less general use, by removing its chief incongruities, and remedving its more striking inconveniences. He showed, by many examples, how great an improvement might be effected by an introduction of very few and trivial changes.

On the Essential Oils and Resins from the Indigenous Vegetation of Victoria.

By 3. W. Osborne.

The indigenous trees and shrubs of the colony of Victoria belong for the most part to the genera Eucalyptus and Melaleuca, which grow in great luxuriance over the greater part of the Australian continent, in no other localities are oil-bearing plants to be found in the same abundance, especially such as attain to arborescent growth, nor is the yield of oil as great elsewhere. The thirty-five samples submitted to the Section are identical with those exhibited in the Victorian Department of the International Exhibition. They were distilled by the Exhibitors, at the request and under the auspices of Dr. Ferdinand Miiller, the Government Botanist of Victoria, to whose great talents and untiring energy the colony is largely indebted. In the present case the rigorous accuracy of the specific name of inch specimen may be accepted on his authority.

The author, as Juror, examined the essential oils and resins with respect to their technological value, for the Victorian Commissioners.

Those from the genera Eucalyptus and Melaleuca (nineteen different oils) resemble the Cajuput of India, Mvlaletica leucadendrotu In smell and taste they are generally more camphoraceous, partaking sometimes of the odour of oil of lemon. Their colour is for the most part a pale yellow, sometimes colourless, and occasionally green. Their specific gravity, in the samples submitted to the Section, varies from 0 881 to 0-940, the average "being about 0-910. These oils have all two boiling-points, the lower being, generally speaking, about 325°, and the other about 40° higher.

They bum well in suitable lamps, and are not dangerous, as they are ignited with difficulty. As solvents for resinous bodies, they surpass most liquids of the kind, and form varnishes, attacking with readiness the intractable Kauric gum of New Zealand. The yield from individuals of the series is sometimes exceedingly large, E. amyqdalina giving by distillation of 100 lbs. of its green leaves and branchlets, three pints of oil; E. oleosa, 20 ounces; E. sideroxylon, 10 ounces; M. linarifolia, 28 ounces, &c. It is estimated that 12,000,000 acres of the colony of Victoria are covered with myrtaceous vegetation of this description, some of it of a shrubby churacter, densely covering vast tracts (E. oleosa, F. M.; E. dutnosa, Cunn.; E\

face of coagulated albumen. Boiling water in abundance was now poured over the paper, after which it was carefully dried. The photographic print thus produced, in consequence of the greasy ink upon the positive portions of the work, was capable of being transferred to stone by the printer, by the well-known mechanical process: and from stones thus prepared, impressions could be pulled in the lithographic press. Numerous specimens were exhibited to the Section.

On the Manufacture of Hydrocarbon Oils, Paraffin, <Jr., from Peat. By B. H. Paul, Ph.D. The author described the results that had beeu obtained at some works lately erected under his direction in the island of Lewis, N.B. The peat of that locality was described as a peculiarly rich bituminous variety of mountain peat, yielding from five to ten gallons of refined oils and paraffin from the ton. The results obtained at these works were contrasted with those obtained at the works of the Irish Peat Company some years ogo,where the produce of oil was not more than two gallons from the ton of peat. This difference in the produce was ascribed, in a great degree, to the improper mode of working adopted at the Irish works. One of the most important points dwelt upon was the necessity of regarding the hydrocarbon oils and paraffin, as the only products that would afford a profit in working peat; and the failure of the Irish works was attributed to the attempt to obtain other products which could only be regarded as waste, and not worth working, unless the oils and paraffin were obtainable in a remunerative amount from the peat.

On the Decay and Preservation of Stone employed in Building.
By B. H. Paul, Ph.D.

The causes and nature of the decay of building-stone were described as being both chemical and mechanical, and varying according to the nature of the stone and the conditions to which it was exposed. The various methods which have been proposed for the preservation of stone from decay were described in detail; the author considering, from a chemical point of view, that none of them presented any probability of success in effecting the desired result, and that the discovery ot an efficient and practicable means of preventing the decay of stone, especially in towns, still remains to be made.

On the Artificial Formation of Populine, and on a new Class of Organic

Compounds. By T. L. Phipson, M.B., Ph.D., F.C.S. £c. The interesting substance populine was extracted in 1830 by Braeonnot from the mother-liquors which had deposited salicine when the latter was obtained from the leaves ana the bark of the pop'ar tree (Popul'is tremula). It was submitted to an important series of experiments by Piria in 1862, who found, among other interesting facts, that, in a variety of circumstances, populine split up into benjoic acid and salicine:—

0« ipa o,s + 2IIO = C"4 H» O3, HO + CM H19 0".
Populine. Benzoic acid. Salicine.

It occurred to me that salicine and benzoic acid might be combined so as to reproduce populine. And this I find to be the case: when equal equivalents of salicine and benzoic acid are dissolved in alcohol and the liquid evaporated to about half its built, magnificent acicular crystals of populine are obtained, some of which in my experiments measured nearly an inch in length. For every 100 parts of salicine must be taken 43 parts of benzoic acid. Or fo.-100 parts of salicine, 53 o parts of benzoate of soda and a sufficient quantity of diluted sulphuric acid to saturate the soda of the benzoate ; alcohol is then added, and the sulphate of soda separated by filtration. By evaporating the solution long needles of populine V* obtained:—

C'«H60' + C2(lII,8Ol* = (C^H^O18 + 2 HO).
Benzoic aoid. Salicine. Crystallized populine.

The properties of the populine thus formed are precisely those of the naturtl

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