. Memoirs and proceedings of the Manchester Literary & Philosophical Society. and shiningappearance. The precipitate cannot be expected to be verydefinite in composition, but a quantity was obtained foranalysis, separated as completely as possible from thepowdered glass and thoroughly washed. It was dried ati20-C.,and then appeared as a nearly white powder, easily 12 Jones, Action of Alkalies on Glass and on Paraffin. fusible in the Bunsen flame, whicli was tinged bright analysis it was found to contain silica 6574, aluminaand iron 326, and lime 1411 percent. There was alsocombined w
. Memoirs and proceedings of the Manchester Literary & Philosophical Society. and shiningappearance. The precipitate cannot be expected to be verydefinite in composition, but a quantity was obtained foranalysis, separated as completely as possible from thepowdered glass and thoroughly washed. It was dried ati20-C.,and then appeared as a nearly white powder, easily 12 Jones, Action of Alkalies on Glass and on Paraffin. fusible in the Bunsen flame, whicli was tinged bright analysis it was found to contain silica 6574, aluminaand iron 326, and lime 1411 percent. There was alsocombined water. On reviewing these results it appearsclear that none of the three alkaline solutions experi-mented on exerts any appreciable action on glass bottlesin the first few hours, and it seems therefore difficult to. Fig. that the accuracy of the Icltenkofer test forcarbon dioxide can be appreciabU- affected by the use ofany one of them. On prolonged contact in a glass bottle there is amarked,[action in the case of lime water, but not in of the two other alkaline solutions, which lose ver)-little oftheir alkalinity even when in contact with powdered Manchester Memoirs, V^ol. xlvii. (1902), No. V*. 13 glass. When more dilute solutions of baryta water wereemployed, the action on powdered glass was distinct, butthis has no bearing on the Pettenkofer test. Solutions ofall three alkaline earths acted on silica, lime to thegreatest extent and baryta least, strontia, as in so manyof its reactions, standing mid-way between lime andbaryta. It may be objected that the preceding experiments,carried on in bottles of small capacity, cannot be fairly com-pared with those carried on in the large bottles requiredfor the Pettenkofer test. To settle this point the followingexperiment was made. Ba
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