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20 LANTERN-SLIDE MAKING AND EXHIBITING. No. 2. Nitrate of silver 100 gr. Distilled water 3 oz. Add 6 minims of No. 2 to one ounce of No. 1 just before use. The slide must be freed from every trace of hypo before treatment, or stains will result. In- tensify in a dish kept for the purpose. If the inten- sifier becomes turbid before sufficient intensity is obtained throw it off and mix some fresh. Dis- tilled water only must be used. When the slide is sufficiently dense wash, and replace in the hypo bath for a few minutes, then wash again to remove hypo and dry. In drying lantern slides be very care- Hints on Drying ful to avo id dust specks, which, although almost invisible, will prove a great eyesore and quite mar the result when the enlarged image is projected on the screen. A large empty box covered with a piece of fine muslin in lieu of a lid is a convenient method of drying slides and at the same time avoiding dust. Directly the slide is dry it should How to VarnUh be var ni s hed and bound up. Var- nishing a gelatine slide is usually considered to be unnecessary, but it imparts great transparency to the shadows, and adds to the bril- liance of the slide as well as affording protection from atmospheric influences, and thereby conducing to its future permanence. Any good negative varnish may be employed. Its application requires a little knack which, however, is soon learnt. Slightly warm the slide, then hold it quite level, and pour on a pool of varnish about the size of a five- shilling piece in the centre, cause it to flow, by