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THE BOOK OF THE LANTERN. 75 easy matter, but in large halls, which are now commonly lighted by one or two sunlights high overhead, the operator finds himself in a serious difficulty. In this jet the two gases do not mix until they reach the point of combustion, and for this reason the apparatus is dis- tinguished by the word " safety." For hydrogen and oxyen, when mixed together, form an explosive vapour of most terrible power, and one which is most difficult to control. If any one should wish to prove this, let him fill a soda-water bottle with the gases over a pneumatic trough in the proportions of two volumes of hydrogen to one of oxygen. Then close the bottle with a well-greased cork, and, after wrapping it in a towel in case of fracture, take out the cork, and put the mouth of the bottle in front of a candle flame. The report caused by the explosion of the gases will be quite equal to a heavily-charged fowling- piece. But when the two gases are used in conjunction with the safety-jet there is no risk of explosion, for no mixture takes place until the gases meet on the lime cylinder. I know that accidents have happened when this jet has been in use, but they are traceable to im- proper use of the apparatus. A case of this kind came under my notice quite lately. An optician had employed a new hand to see after the making of the oxygen gas and filling the bag with the same. This individual was, after a time, left to his own devices, and finding, upon one occasion, that the bag was not full, he attached it to the nearest gas-bracket until it was properly distended. This bag was used in public the same evening, and a few minutes after bhe proceedings commenced it blew up, and,