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and throw out rays; in case of wind or fog, it will appear dan sud spotted ; and, pre. viously to snow, it will look quite muddy. If placed in a moderate temperature, it will require no other trouble than to pour out a common tumbler of water, and pat in the same quantity of fresh. For the the first few days it must not be shaken.

Dr. CLARKE's third vo'ume of his Travels will appear in a few days It will form the second section of the I'ravels in Greece, t gyp and the Holo Land; completing the second part of the whole work according to the plan originally proposed by the author, and will contain his voyage up the Nile to grand Cairo, his observations upon the Pyramids of Djiza and and Saccara; a description of the remains of the city of Sais on the Delta; an account f the Antiquities of Alexandria, particularly of Pom. pey's Pillar and the Cryptæ of Necropolis ; with his subsequent Voyage, and Travels in Greece, Macedonia, Thrace, &c. &c.

In one of Mr. BAKEWEIL's Lectures at the Surry institution, delivered during the present month, he adverted to the possibility of applying GUNPOWDER as a first mover of machinery. As this subject is highly curious, and well deserving the at. tention of mechanics, we shall give his words as nearly as we can recolleet: "Almost all the machines of the ancients," said he,“ were set in motion by the musco. lar action of men or quadrupeds; but the moderns have called the elements to their aid, and made the winds and the waters subservient to their use. Natural phi losophy has brought other agents into action ; and the application of elastie fiuids, partioularly of steam, as a mover of machines, has greatly enlarged the empire of man over nature. It is highly probable, that another agent may hereafter be substituted ; an agent which has hitherto been chiefly employed for purposes of destruction, I mean gunpowder. I have little doubt that the expansive force of this substance might be immediately and sately applied to keep in motion large machines with much less expense than by the steam engine. The apparatus would, I conceive, be les cumbersome and expensive. A single dram of gunpowder, if properly applied, wil rend a solid block of metal equal in thickness to a large piece of ordnance. The practical mechanic will have no difficulty in conceiring how an equable motion may be communicated to machines by percussion, with the aid of a balance wheel and crank.”

A volume of Sermons is in the press by the Rev. ARCHIBALD ALLISON, LL. D. Prebendary of Sarum, and author of t.ssays on the Nature and Principles of Taste

The PRINCESS ELIZABETH, whose literary and inventive powers have often been displayed through her pen and pencil, and which have always done so much eredit to her gening and exalted rauk, has, we are informed, been long engaged in a series of biographical sketches, which to a future age are likely to constitute the secret memoirs of a considerable part of her father's eventful reign.

The Personal Travels of M. de HUMBOLDT to the Equinoctial Regions of the New Continent during the years 1799--1804; with a Picturesque Atlas, Maps, Plans, &c. translated into English by Helen Maria Williams, will appear in a few weeks.

Singular new discovered body. About a fortnight ago Sir Joseph Banks received a letter from Sir Humphrey Davy, who is at present in Paris, mentioning a newly discovered violet coloured gas, which had lately attracted the notice of men of science: but no particulars are given of its nature or production.

In the Journal de Paris, for the 3d of December, it is stated, that a memoir on this substance, by Clement and Desormes, had been read before the French Institute, and the following circumstances respecting it are stated. It was discovered by M. Courtois, and was obtained from kelp. When heated to 158° it is converted into a gaseous substance of a strong violet colour. It is not acted on by oxygen, charcoal, or a red heat. With hydrogen and with phosphorus it produccs muriatic acid It combines with the metals without effervesence. It combines also with'the metallic ox. ides, and forms compounds soluble in water. With ammonia it forms a detonating compound.

This notice is rather enigmatical ; but it would appear from it that the substance in question bas many properties in common with chiorine. Hence it is probably a compound of chlorine and some other body. What is meant by saying, that with phosphorus it forms muriatic acid, I do not understand. A few weeks will probably put us in possession of the mode of preparing this substance, and of course enable us to examine it.

When ammoniacal gas comes in contact with the oxymuriate of sulphur, it assumes a violet colour of great intensity and beauty. Whether this has any connexion with the substance in question time will determine.

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