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THE BOOK OF THE LANTERN. 93 T know most of the lecture-halls in the kingdom, but I am not aware of a single one where this arrangement exists. The lecturer who visits these places is responsible for bringing his own screen, and his assistant must fit it up, an operation which is sometimes,—owing to the structure of the hall,—very troublesome and difficult. A permanent rolled-up screen would obviate all this difficulty, and would add greatly, for the reasons already given, to the success of the exhibition. I can only suppose that this is one of those matters which comes under the head of everybody's business, and therefore nobody attends to it, or seeks to remedy what I feel is a mistake. We will next consider the method of hanging a sheet on a portable frame. Some lecturers adopt this plan, and if they are not afraid of adding to their luggage a huge bundle of sticks, they certainly have the advantage of being independent of ladders, staples, and all the things necessary for hanging a sheet in the ordinary way. There are several descriptions of frames made for this purpose, which are sold by dealers ; some are good, and some are very much the reverse, giving much more trouble than they are worth. Perhaps the best form of frame is that which is made of round pine sticks, about 4 or 5 feet long, like broom-sticks, and which fit to one another,— fishing-rod fashion,—by means of brass sockets. The corners of the frame are represented by sockets mitred, and brazed together, see fig. 37. Such a frame as this is easily put up. First of all the top pieces are socketed together, and furnished with their corner pieces and one length of the wooden rods. The side pieces are next placed in their