Volume 3 / Book 4 — Record of Scientific Discovery.

Photography.—Two alleged improvements in Photography have laid claim to public attention: one the product of France, the other of the United States. The French discovery was recently communicated to the Academy of Sciences in Paris, by M. Blanquart-Evrard, and consists in a mode of whitening the sides of the camera, and also the interior of the tube, to which opticians have hitherto been accustomed to give a coating of black. By the new improvement, it is claimed, a saving of one-half is effected in the time required to produce a picture, beside the additional advantages of increased uniformity of action, and less necessity for a powerful light, together with less resistance from red, yellow and green rays. The plan has been experimented upon with success both in France and England. The second and latest invention is the Hillotype; so-called, in the absence of a better name, from Mr. L. L. Hill, of Greene Co., N. Y., who claims the discovery of a process, whereby photographic impressions can be produced with the complete colors of nature. It is stated that a number of successful experiments have established the practicability of the new plan, and that landscapes, sunset-scenes, portraits, &c., have been produced with marvellous fidelity. We shall presently know more of these asseverations. As yet, the entire process is concealed, and, as in certain other instances, may never come to light.

The London Society of Arts.—In a paper by Mr. Murchison, read before the London Society of Arts, we find an interesting account of the origin and early history of that distinguished body. Efforts having been perseveringly made for the establishment of an institution for the promotion of the arts, sciences, and manufactures of the kingdom, the Society of Arts was finally organized in London, in the year 1754, under the auspices of Lord Rodney and other prominent persons. The success of this organization was encouraging and signal. Subscriptions poured in upon it, and a large number of members were soon enrolled. Premiums were then established; the first being one of £30 for the discovery of pure cobalt, and another of the same amount for the cultivation of madder. The progress of the Society from that period to the present has been uniformly encouraging, and it now ranks among the foremost scientific institutions of the day.

An anecdote of the artist Barry, some of whose best works adorn the walls of the Society's Rooms, is related in connection with this accompt. Barry being in distress, the sum of £1200 was subscribed by the members for his relief, and with this amount it was determined to procure for him a life annuity. The funds were so applied; the payment of the annuity to Barry being confided to the father of the late Sir Robert Peel. After the receipt of the first quarter of the first year, however, the artist died. The balance of the purchase money was absorbed in the coffers of Sir Robert.

Gold.—M. Fremy, successor to Gay-Lussac in the chair of chemistry at the Garden of Plants, Paris, has submitted to the French Academy the results of his Chemical Researches on Gold. It was considered important to these researches to study the combinations of the oxides of gold with the alkalis so extensively employed in gilding. The aurates were easily produced, but it was impossible to obtain the combination of alkalis and the protoxide of gold. Auric acid was produced by boiling the perchlaide of gold with excess of potash, precipitating the auric acid by sulphuric acid, and purifying the former by solution in concentrated nitric acid; afterward precipitating by means of water and washing the auric acid until the liquor contained no trace of nitric acid. The auric acid combines immediately with potash and soda. Mr. Fremy promises an examination of the question whether gold is able, in combining with oxygen, to form a salifiable base, as has been asserted. The present experiment was undertaken mainly in reference to its use in electro-gilding.

Light and Heat.—Prof. Moigno lately presented to the French Academy a memoir on the experiments of Neeft, in Frankfort, on the development of Light and Heat in the galvanic circuit. M. Moigno witnessed these experiments in person, and considers it proved, first, that light always appears at the negative pole, and that this primitive light is independent of combustion; second, that the source of the heat is properly the positive poles, and that this heat is originally dark heat; thirdly, that light and heat do not unite at the instant of evolution, but only after the intensity of each has reached a certain point; from this union ensue the phenomena of flame and combustion.

Chinese Coal.—A late number of the Chinese Repository contains some notices of Coal in China, by Dr. D. J. Macgowan, in which occur a number of curious and interesting facts. Coal deposits are found to exist throughout the mountain ranges which girt the great plain of China; but unskilful mining and the difficulty of transportation enhance its cost and limit the consumption, so that it is little used except for culinary and manufacturing purposes. The best comes from Pingting-chau in Shánsí; the quality most in demand in central China is called the Kwang coal, and is brought from various districts in Húnán. Numerous varieties are produced in the province of Kiangsú—slaty, cannel, bituminous and anthracite. This portion of the mineral wealth of China is computed at nearly six millions of dollars. The scarcity of the supply is owing not to the poverty of the mines, but chiefly to the want of facilities for mining, which can alone be supplied by the steam-engine.

Water of the Ocean.—The results of observations on the different Chemical Conditions of Water, at the Surface of the Ocean and at the Bottom, on Soundings, have been communicated by Mr. A. A. Hayes, State Assayer of Massachusetts; who states, that while pursuing the subject of copper corrosion at the surface of the ocean, he was some years since led to examine samples of copper, which had remained some time at the bottom of the ocean. He found that copper and bronze, and even a brass compound, from the bottom, were thickly incrusted with a sulphuret of copper, frequently found in crystallized layers, having a constant chemical composition, entirely free from chlorine or oxygen, the corroding agents of the surface. Specimens of copper and bronze from mud and clay at different depths, and in one instance from clean sand below a powerful rapid, gave thick layers of sulphuret of copper, or copper and tin. Instances of the corrosion of silver are also adduced. Mr. Hayes concludes that the waters from the land, which are never destitute of organic matter in a changing state, exert a very important influence in causing the differences of chemical condition in the ocean. Organic matter, he argues, dissolved from the surface of the earth, or from rocks percolating the strata, assumes a state in which it powerfully attracts oxygen; and waters holding this matter in solution readily decompose sulphates of lime and soda even when partially exposed to atmospheric air.

The Asteroids.—A letter from Prof. Lewis R. Gibbs, of the Charleston Observatory, given in the Charleston Evening News, enumerates thirteen Kuam Asteroids; three having been discovered during the past year. The following Table gives their names in order of discovery, date of discovery, name and residence of discoverer, and the mean distances of the Asteroids from the sun, that of the earth being called 1:

Name.Date.Discov'r.Place.M. Dist.

1.Ceres1801, Jan. 1Piazzi,Palermo2,766

2.Pallas1802, Mar. 28Olbers,Bremen2,772

3.Juno1804, Sept. 1Harding,Lilienthal2,671

4.Vesta1807, Mar. 29Olbers,Bremen2,361

5.Astræa1845, Dec. 8Hencke,Driessen2,420

6.Hebe1847, July 1Hencke,Driessen2,420

7.Iris1847, Aug. 13Hind,London2,385

8.Flora1847, Oct. 18Hind,London2,202

9.Metis1848, April 25Graham,Markree2,386

10.Hygeia1849, April 12Gasparis,Naples3,122

11.Parthenope1850, May 11Gasparis,Naples2,440

12.Clio1850, Sept. 13Hind,London2,330

13.Not named1850, Nov. 2Gasparis,NaplesUnk'wn

It appears that of these thirteen Asteroids, three have been discovered by Hind of London, three by Gasparis of Naples, two by Hencke of Driessen, two by Olbers of Bremen, while Piazzi of Palermo, Harding of Lilienthal, and Graham of Markree, have each discovered one. Eight out of the twelve orbits ascertained have an inclination of less than ten degrees. The London Athenæum states that the Lalande Medal of the Paris Academy of Sciences has been awarded to M. de Gasparis for his discovery of the planet Hygeia. The prize for 1850 was shared between Gasparis for his two discoveries in November, and Mr. Hind for his discovery of Clio on the 13th of September.

Geology of Spain.—A late number of the Journal of the British Geological Society contains an interesting and valuable paper by Don Joaquin Ezquerra Del Bayo, on the Geology of Spain. The Geological constitution of the country is stated to consist of three principal divisions—the Crystalline, Transition, and Secondary formations. The gneiss rocks of the first division occupy about a fifth of the surface of the soil, extending longitudinally from north to south. The plutonic rocks which penetrate them are generally granite of various degrees of firmness. The most important of the granitic ramifications to the east passes by the Sierra de Gridos, Sierra d'Avila, and the Guadarrama, to Soma Sierra, in a north-east direction. The great granitic outburst of Truxillo and of the mountains of Toledo does not extend so far to the east. A third, which has probably given its present form to the Sierra Morena, terminates at Linares, in the province of Jaen. The rocks are not rich in useful metals compared with their great development, but lead and copper are found in great quantities in the district of Linares, and rich argentiferous veins have been lately discovered at Hiendeleucina. Other veins have become exhausted. The successive formations of the country present some curious features. "Our soil," says Don Joaquin, "has never been at rest, nor is it so even at present. Earthquakes are still often felt at Granada, and along the coast of the province of Alicante, where their effects have been disastrous." Among the numerous fossils found upon the coast of Spain are some species of mollusca of an extraordinary size, and in the vicinity of Cuevas de Vera the remains of elephants have been found, isolated and distributed in different directions, proving the existence of a more tropical climate in former times than now prevails in those districts.

In the Paris Academy of Sciences an extended Report was read at a recent meeting from a committee on M. Rochet d'Hericourt's third journey in Abyssinia, in the northern part. He started in 1847, and returned in 1849. In Geography he determined directly, by observation of the meridian heights of the sun, the latitude of a large number of geographical points in Egypt, in Arabia Petræa, along the coasts of the Red Sea, and in the north of Abyssinia. His meteorological observations were constant, and are pronounced especially exact. So, those of the magnetic inclination. The results are furnished in the Report. He attended closely and successfully to the geology of the regions which he traversed. The geological constitution of Abyssinia is now made known over the greater part of its surface. The herbary which the traveller brought to the Museum of Natural History, consists of 150 species, the most of them, however, of plants already known. Three new ones are described. He succeeded in getting home a sheep of Abyssinia, remarkable for the long hairs of its fleece. Some of his specimens of fish are new. Much attention is given to his new species of Epeira, or silk-spider. At the sight of the silk which forms the web of the insect, he conceived the hope that it might be turned to account for the silk-manufacture. It is very fine and soft, long and firm enough, and of a beautiful yellow color. This spider inhabits the large trees, shrubbery, and hedges, and extends its webs to the neighboring habitations; and the webs are nearly all more than a yard in diameter. The quantity is prodigious. "M. d'Hericourt," says the Report, "like every person who has attempted tissues with spiders' webs or cocoons, has not sufficiently regarded the difficulty of domesticating them, as is done with the silk-worm, in order to multiply them adequately, and provide them with such insects of prey, or sufficient nourishment." The Committee proposed the formal thanks of the Academy to the traveller, for the scientific harvest of his new journey, and an expression of the interest felt in the speedy publication of his narrative.

Shooting-Stars.—M. Quetelet states, in relation to the Shooting-Stars of August, 1850, that the number per hour on the evening of the 9th of August was about 60 for Brussels; on the evening of the 10th, 111 for Brussels, 180 for Markree, Ireland, and 58 for Rome. The direction was the same in each place.