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

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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.

OBGANIC OHEMISTBY. capacity for heat. Although subsequent research has shown that this law does not apply in every case, it still remains a valuable means of controlling the atomic-weight determinations of many elements. In the same year a discovery of equal importance was an* nounced by Mitacberlich—that of the law of Isomorphism. According to this law, chemically analogous elements can replace eaoh other in many crystalline compounds, either wholly or in part, without any change occurring in the crystalline form of the compound.

These important observations attracted but little attention or consideration" front Eichter's contemporaries, all of whom were busily engaged in carrying on the phlogistic war. The investigations of Riohter and his predecessors had reference mainly to the proportions by weight in -which those bodies unite, which, according to Lavoisier's theory, are not simple substances, whilst Lavoisier recognised the fact that the elements themselves combine in definite proportions by weight. In opposition to this view of combination in definite unalterable quantities, L.

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