The Annals and magazine of natural history; zoology, botany, and geology . ion,was essential to carrying out the investigation, I directed my atten-tion to the preparation of pure distilled water. Having always foundlife in distilled water prepared by the ordinary methods by keepingit a few days, after many trials I employed the following apparatus,which gave very satisfactory results, as it enabled me to obtain waterwhich remained free from life for several months. It consists of two flasks, A and B (A rather larger than B), fittedwith perforated caoutchouc stoppers*. These flasks are connect
The Annals and magazine of natural history; zoology, botany, and geology . ion,was essential to carrying out the investigation, I directed my atten-tion to the preparation of pure distilled water. Having always foundlife in distilled water prepared by the ordinary methods by keepingit a few days, after many trials I employed the following apparatus,which gave very satisfactory results, as it enabled me to obtain waterwhich remained free from life for several months. It consists of two flasks, A and B (A rather larger than B), fittedwith perforated caoutchouc stoppers*. These flasks are connectedby the tube D. Into the stopper of A is fitted a tube C, to which isjoined a piece of caoutchouc tubing, which may be closed by the * The stoppers and caoutchouc tubing used for the various joints must benew, and must be well boiled in water before use. 64 Royal Society :— clip E. Through the stopper of B is a siphon, F, the long limb ofwhich is cut and joined with caoutchouc tubing, which can be closedby the chp G. Through this stopper is a third tube, H, connected. by caoutchouc with the tube I; this can be closed by the clip tube I is about 3 feet long, and goes into the vessel L, whichis partly filled with water. The water to be distilled is mixed with solution of potash andpermanganate of potash, and placed in the flask A*. Before distil-lation is commenced, a rapid current of pure hydrogen, or someother gas, must be passed through the apparatus by the tube C todisplace the air and carry off all the germs the air may have clip G is first left open, then this closed and the clip K opened,which allows the gas to pass through the water in the vessel L. The gas should be passed through for about fifteen minutes. Theclip E is then closed, and the distillation carried on. When the opera-tion is complete, the gas must be again passed through the appa-ratus, and the connexion with the tube I broken by closing theclip K. The water is drawn off through the si
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