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The tin sulphide only dissolves; it is filtered off and converted into stannic acid, while the lead sulphide is transformed into sulphate and weighed as such. By MR. BONNEVILLE. To a cold solution containing 1 per cent. of bromine, 1 per cent. of caustic soda at 36 deg. B. is added, then the material, to be bleached is first wet and then immersed in this bath until completely decolorized.

This arrangement provided adequate protection against materials of the Blue Cross type used by the enemy, as, for instance, stannic chloride, whilst the German Blue Cross gas, which was more penetrating, was only retained to a moderate degree." This is a direct admission that, in order to counter the Allied use of Blue Cross gas, further filtering arrangements would have been necessary.

Tin is usually said to be dyad in stannous compounds and a tetrad in stannic compounds, but in a compound like SnCl AmCl, is not tin really a tetrad? and yet it is a stannous compound, and gives a black precipitate with H S; so that valency does not necessarily go with the series.

I may also, in the last instance, mention that I have found the above methods of electro-dissolution peculiarly adapted for the preparation of unstable compounds such as stannic nitrate, potassic ferrate, ferric acetate, which are decomposed on the application of heat, and in some instances have succeeded by the following means of crystallizing the resulting compound obtained. Chem. News. Dr.

The latter object is accomplished by oxidation to stannic chloride by means of mercuric chloride added in excess, as the mercuric salts have no effect upon ferrous iron or the bichromate. The reactions involved are: 2FeCl + SnCl > 2FeCl + SnCl SnCl + 2HgCl > SnCl + 2HgCl The mercurous chloride is precipitated.