The Science record; a compendium of scientific progress and discovery . iquid to the surface N now of sucking, as with thecommon siphon, one blows into themouthpiece M ; and in consequenceof the compression of air, the loweropening is shut by the ball k, whilethe liquid rises in h, and begins toflowthrough^in the usual way. If thevessel to be emptied is not full, or the column of liquid asmall one, it is then necessary, before blowing into themouthpiece, to suck it slightly, in order to obtain a largervolume of the liquid in^v as one condition for the rightaction of the instrument is
The Science record; a compendium of scientific progress and discovery . iquid to the surface N now of sucking, as with thecommon siphon, one blows into themouthpiece M ; and in consequenceof the compression of air, the loweropening is shut by the ball k, whilethe liquid rises in h, and begins toflowthrough^in the usual way. If thevessel to be emptied is not full, or the column of liquid asmall one, it is then necessary, before blowing into themouthpiece, to suck it slightly, in order to obtain a largervolume of the liquid in^v as one condition for the rightaction of the instrument is that hh should be filled beforethe column of liquid in g sinks to the mouth of thesiphon at k, when one blows through M. CLEANSING the flasks have contained resin solutions, they are tobe washed with caustic alkaline lyes and finally rinsedwith alcohol; if they have contained essential oils, suchas oil of turpentine, petroleum, photogene, etc., they arerinsed with one to one and a half ounces of sulphuricacid, and then well washed out in a stream of TECHNOLOGY. 179 SIMPLE PROCESS FOR STANNIC Professor Bronner.—Stannic chloride, as used bythe dyers and calico-printers, appears, commercially, inwhite, crystalline, and more or less solid masses. It ismuch used in producing scarlet on woolens. It is but sel-dom pure, containing especially small quantities of iron,and almost always varying quantities of sodium iron being positively injurious for scarlets, and noteasily removable by the dyers, and the sodium chloridealso being objectionable, a simple method is given bywhich the dyer may prepare his own stannic stannous chloride is taken, which should not give ablue precipitate with potassium ferrocyanide, or white withbarium chloride, and this is treated in a porcelain dishwith its own weight of pure fuming hydrochloric acid, andthen with four times its weight of boiling water. By ad-dition of potassium chlorate in small suc
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