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142 SCIOPTICON MANUAL. without glass, and varnished, it appears rather better with less cost. DECALCOMANIA, OR ENAMEL SLIDES. —Impressions made on starched paper and fixed to glass, as above described, will adhere to the varnish when the paper is afterwards wet and pulled off entire. After soaking off the starch, by flowing water and a soft brush, the picture is dried and flowed with ordinary slide varnish. These so-called Enamel Slides are inferior to silver prints, and are sold, both plain and colored, at a cheaper rate. Should the paper prints, in good variety, eventually be sold to the public, full directions for transferring them would doubtless also be supplied. On this supposition only, would this truly interesting process promise to become available for amateurs. TYPE PRINTING upon glass, except in a poor way with elastic type, is impracticable. Hymns, mottoes, &c., may, however, be printed to advantage upon sheet gelatine, in the small amateur printing-presses now so much in vogue. Plain collodion films, dried upon oiled glass, upon a levelling stand, and peeled off, will take impres- sions perfectly. These films may be mounted between glass plates, in the form of a crystal slide. WITH QUARTER-PLATE GLASS prepared as described to receive, like paper, not only colors but pen and pencil drawings, we may copy engravings for the lantern by superposition, or in a camera similar to the one illus- trated by Fig. 31, may show up, as by magic, all that class of illustrations now in vogue as " blackboard ex- ercises;" may suit original designs to the various cir- cumstances of time and place; may transcribe hymns, mottoes, &c., appropriate to each occasion; and so, with small expense and ordinary skill, the Sciopticon becomes