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THE BOOK OF THE LANTERN. 77 recommend the employment of two different kinds of tubing. There is a hard black kind, made, I fancy, in France, but easily procurable in this country, which wears extremely well, far better, indeed, than the ordinary grey kind. It is cheap as well as good. The only part where it seems to deteriorate is the end, where it is being constantly fitted on to the metal jet. This gets soft and rough after some time, a failing which is easily remedied by judicious amputation. Use for each gas a sufficient length of this black tubing, and firmly attach to the end of each piece a short length of the more elastic red tubing, by which connexion with the bottle and house gas respec- tively can be easily made. In joining the two kinds of tubing together, use a couple of inches of lead pipe as a connecting link between them. First draw the black tubing half way over the lead, and then, if possible, allow the red tube to cover both, securing the whole with string. , - Having all these things ready, the H tube fastened to the nearest gas supply, and the 0 tube to the bottle or bag, we can proceed to work. Let the lime-pin be so adjusted that the lime is about 1-16th of an inch from the nozzle of the jet. Then turn on the tap marked H, and light the jet. Turn down the gas until the flame is about one inch high, and let matters thus remain for five minutes, to give the lime time to warm through. Without this pre- caution, and if the oxygen is turned on at once, the lime is apt to split up from the sudden heat. After this five minutes' rest, you may attend to the oxygen supply. If the gas is supplied from a bottle or