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THE BOOK OF THE LANTERN. 85 with a handle at the middle and a stop-cock projecting up- ward at each end. A neck, like that of a bottle, projects from the screw cap at the end, and is closed with a cork for convenience in filling. The passage for oxygen is over 20 inches long, in the form of a zig-zag channel through the upper surface of the roll of porous material, and secures complete saturation of the gas with vapour. The saturator can be filled from a bottle in one minute, and is ready for use at once, or may be kept filled for any length of time. Petroleum ether costs only thirty cents a pound, which is less than half the price of sulphuric ether ; it also vaporises at a lower temperature, so that the light can be used successfully even in a very cold room, and it has other advantages. It will supply a pair of lanterns con- nected by dissolving key, for two hours continuously. It should be stored in a cool place and kept tightly corked. It is also necessary, when using it with oxygen from a cylinder, to use a valve that can be opened very slowly, because a very small amount of oxygen passing the satu- rator will produce a very large flame at the jet. The Shaw valve, manufactured by Mr. Shaw, a member of this Institute, fulfils the requirements, and is already largely used in this city. Some special instruction for the manage- ment of the light in hot weather may also be called for. " In conclusion, I give it as my opinion that this im- proved means for supplying the hydrogen element is so much simpler and more convenient than any other, that it cannot fail to entirely supersede the use of hydrogen and coal-gas, when its merits shall have become generally known and appreciated."