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THE BOOK OF THE LANTERN. 141 well to try it in the lantern first, in order that any little blemish not before detected can be remedied. Any little clear spot where a clear spot has no business to be can be touched with India ink. If the picture is to be coloured, the slide need not be so firmly bound up as one to be used plain. A cover glass, separated from the photograph by a paper mask, with a round, square, or cushion-shaped open- ing, and fastened with one or two slips of gummed (stamp) paper, is quite sufficient until the artist is ready with his palette and brushes. But if the slide is to be exhibited as a plain photograph, it may as well be bound together as it is to remain. For this purpose we require slips of gummed paper fourteen inches long by three-eighths of an inch broad. The paper (black needle paper is the best) should be gummed before being cut, and one sheet will provide for about a hundred pictures. Mix powdered gum arabic with one fourth its weight of loaf sugar, and add sufficient water to make a thick mucilage. Paint the paper liberally with this, and hang it up to dry. When dry it can be cut into slips of the above size. To mount a picture, damp one of the slips of gummed paper, and put it sticky side upwards on the table before you. Now take a slide, duly fitted with its black mask, and a cover glass, all perfectly clean and free from dust. Hold the combination tightly between the fingers, and bring one edge down on the end of the gummed slip. Now treat the slide as a porter treats a heavy box,—turn it over and over along the slip of gummed paper, so that each edge will take up its quantum. Now carefully fold down the edges, neatly adjust the corners, and the thing is done.