Editorial note — INDEX

I have to thank Professor Church for the results of an analysis of a snuff-bottle ‘like nearly white jade or milk-quartz faintly greenish.’ It contained lead-oxide, 48·3 per cent.; potash, 8·8 per cent.; soda, 1·1 per cent.; and silica, 41·5 per cent. We have here a remarkably pure potash-lead glass, for only 0·2 per cent, of alumina and iron oxide was found. The specific gravity of this specimen was 3·8; that of another bottle of clear strong green glass was 3·7.