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76 THE BOOK OF THE LANTERN. besides wrecking the lantern, smashed all the windows in the hall. The cause of the disaster leaked out afterwards. But with proper care this jet is perfectly safe, and one which I have used scores of times for purposes of demonstration in crowded school-rooms. As the bulk of my readers are more likely to adopt this form of limelight than any other, I will give directions for working with it which will at once show its simplicity. We will suppose, in order to make the matter clearer, that the operator has a single lantern fitted with this form of jet. Beyond the mere lantern and its belongings, there will be required some india-rubber tubing, a box of limes, and a bag or bottle of gas. The best rubber tubing is the red variety; but it is expensive. It will, therefore, be found economical to adopt a plan which I myself have practised with advantage. Two lengths of tubing are required, one for each of the gases employed. A 6-foot length will be sufficient to connect the 0 side of the jet with the iron bottle or bag; but the length of the other piece of tubing, which is to connect the H side of the jet with the nearest house gas-burner, is obviously dependent upon the distance of that supply from the place where the lantern is being exhibited. If the nearest tap is in another room, it is best to use a length of compo. (lead) gas-pipe, which is absurdly cheap. Upon one occasion I remember drawing the gas from another house by such a means of communication, the pipe passing through two windows. But it is only upon rare occasions that such a proceeding is necessary, and the worker is generally able to find a source of gas- supply ready to his hand. When such is the case, I