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South American Woods. 387 Cause of Weakness in the St. Gothard Tunnel.--Investigations have been made of tile cause of weakness in the parts of the St. Gothard tunnel where the vaults were crushed, and it is thought that the accident must be attributed to the action of damp air upon the schists and gneiss, and to the decomposition which resulted therefrom ; the presence of anhydrous sulphate of lime, or karstenite, was also an important agency; its transformation into gypsum is followed by a disaggregation which renders the rock incapable of sustaining its pressure. Other hypotheses have been framed, but M. Loustan considers this as the most plausible.--
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## Abstract For Abstract see ChemInform Abstract in Full Text.
## Abstract The electrostatic ignitibilities of a number of varied substances in the form of dust clouds or powders have been determined under a variety of conditions; the work is divided into three pans. Results for dust clouds of magnesium, aluminium, ferroβmanganese, zinc and silicon are given;