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Through chemical analysis of trachydolerites and phonolites from Madeira and Teneriffe, and their decomposition products, the progress of kaolinization in the rocks is shown. This kaolinization is ascribed to the action of carbon dioxide. Other varieties of decomposition in Teneriffe in which no kaolin was formed are ascribed to contact action, or regional influences. Certain feldspar residues are assumed to be of a colloidal nature.
To Preserve Rubber Tubing. (Pharmac. Journal--from Amer. Mach., xxxiii, 34.)--Inmaerse the rubber tubing in a mixture of I part ammonia and 2 parts water for a time varying from a few minutes to half an hour or an hour, until the original elasticity is regained; or frequently wash tim articles in slightly alkaline water. Keeping the goods in air-fight vessels will preserve them for a long time; and so will well closed tin boxes containing quicklime and ammonium carbonate.
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