The American Art Union is to have its drawing at the end of the present month, having received a sufficient number of subscriptions, at length, to make this step seem advisable in the opinion of its directors.
The Philadelphia Art Union is taking vigorous steps to retrieve its recent losses by fire.
Scientific Discoveries and Proceedings of Learned Societies.
Our countryman, Mr. E. E. Squier, is now in London, where he has just brought out an edition of his work on Nicaragua, and he recently addressed the Royal Society of Literature on the Mexican Hieroglyphics, as exhibited in the publication of Lord Kingsborough. The MSS. engraved in this splendid work are chiefly rituals—a few only being historical. Of the events referred to, some occurred 600 years B. C., and one reference appears to be to an eclipse that happened 900 years B. C. The dualistic principle runs through the Mexican Pantheon; it consists, i. e., of male and female divinities, representing the active and passive principles in nature. We find also in this mythology a trinity, corresponding to Brahma, Vishnu, and Siva—the productive, preserving, and destroying powers—in the Indian. Inferior deities represent attributes; each name denoting an attribute; hence, the gods of the Mexicans were far from being so numerous as they appear to be. The supreme divinity had about fifty names: several of which agree in signification with those applied in the Old Testament to Jehovah. He is represented wearing a mask, to intimate that he cannot be looked upon. For each character or attribute there was a different mask, frequently representing animals; particular animals being dedicated to particular deities. The different deities were likewise symbolized by different colors—the water-god by blue—the god of fire by red—the inferior divinities by a dark tint, &c. Peculiar symbols likewise appear as crests, or head ornaments. The lecturer stated that the Mexican records unquestionably refer to an Eastern origin of the nation.
Respecting experiments in Photography, the London Literary Gazette says "the preparation of albumenized glass plates promised much, and in some hands, as in those of Ross and Thomson of Edinburgh, and Langhenheim of Philadelphia,—the best results have been obtained. Essentially, their processes consist respectively of separating the fluid portion of the white of egg, and adding thereto a weak solution of the iodide of potassium. This is floated over a clean glass plate, so as to cover it with a very thin film, and carefully dried. When this is completed, the prepared surface is dipped into a solution of nitrate of silver, and thus an iodide of silver is formed on the surface. This iodide of silver being washed, as in the calotype process, with gallo-nitrate of silver, is very sensitive to the solar radiations, and being placed in the camera-obscura, is speedily impressed with a dormant image, which is developed by the deoxidizing action of gallic acid." A good steam gauge has long been a desideratum. All kinds of portable gauges are, either not to be depended upon, or subject to frequent repairs; so much so, that by law every steam-engine used in France is provided with a gauge on the barometer principle, that is 10 feet, 15 feet, 20 feet high for a steam pressure of 60 pounds, 90 pounds or 120 pounds to the square inch. Mr. Bourdon, chief engineer at the Creusot works, where the engines of the frigate Mogador, were built, has devised a gauge, which has obtained for him a medal at the London Fair, and is highly spoken of. It is based upon the fact, that a thin metal tube, coiled up and subjected to internal pressure, will tend to uncoil itself in proportion to the amount of the pressure. The tube used is first flattened preparatory to the coiling up, so as to render this operation more easy. One of the extremities communicates with the boiler, the other is pointed and turned up so as to serve as an index on a circular scale. The apparatus is fixed in a case, in the shape of a hair medallion, and closed with a glass. Experiment must show if the effects of temperature be insignificant compared with those of pressure, and if the internal working of metallic atoms will not in time make this gauge give wrong indications.—If the instrument can bear the test of practical use, it will soon supersede every other already known. The inventor has already been rewarded by a council medal at the London Exhibition, and the cross of the Legion of Honor in France. In the last named country, the Government has made provision to try it on all the railways.
Experiments have been made on the Paris and Lyons Railway for the application of electromagnetism to locomotives. The report goes on to say that the apparatus prepared for the purpose was applied to an exceedingly large locomotive, and succeeded perfectly, first on a level, and then on an ascent of thirteen millièmes, the steepest in fact of the line. It was feared that difficulties would arise from the smoothness of the wheels on the rails,—but no inconvenience was perceptible from that circumstance.