By Henry E Roscoe; Carl Schorlemmer; John Cannell Cain; Charles Henry Jeens; Bernard Mouat Jones

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Priestley, M. Sehde et moi"1 Now there is no doubt whatever that in October, 1774 Dr. Priestley informed Lavoisier in Paris, of the discovery he had lately made, and that Lavoisier was at that time unacquainted with the fact that jrreeipitatum per se yields this new gas on beating; Hence we cannot admit Lavoisier's claim to the joint discovery of oxygen, a claim, it is to be remembered, not made until eight years after the event had occurred. In corroboration of this conclusion we find in Priestley's last work, published in 1800, and singularly enough entitled Th Boctri-m of Phlogiston Established, the following succinct account of the matter.

58-6 . ' U7-0 . 169-0 . 191 . 698 . 196-2 . 10 . 113-4 . 126-53 . 192-7 . 55-9 . 139-0 . 206-4 . 7-01 . 23-94 . 54-8 . 199-8 Molybdenum . Nickel . Niobium Nitrogen Osmium. Oxygen . Palladium . Phosphorus. Platinum . Potassium . Rhodium . Rubidium . Ruthenium . Selenium . Silver . Silicon . Sodium . Strontium . Sulphur . Tantalum . Tellurium . Terbium. Thallium Thorium. Tin . . Titanium Tungsten . Uranium . Vanadium . Yttrium . Zine . . Zirconium . Atomic weight. . 95-8 . 58-6 . 94-0 .

This is neither copper nor sulphur, but a chemical compound of the two, in which no particle of either of the substances can be seen, however high a magnifying power be employed, but from which, by the employment of certain chemical means, both copper and sulphur can again be extracted. Here then we have a case of chemical combination. An experiment similar to that made by OHBMIOAL ACTION, 46 Priestley when he discovered oxygen, may serve as an illustration of a chemical decomposition. 2*16 grams1 of ted oxide of mercury are heated in a small retort provided with a receiver, and a gas delivery tube passing to the top of a graduated cylinder filled with water to the beginning of the graduations, and standing in the pneumatic trough over- water (Fig.

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