To make these, some glass cut to the size of the lantern slide, and some prints about the size of the slide, must be selected. A series illustrating travels or manufacture will be found a very suitable subject. The print is well covered with starch paste on the picture side, and laid on one of the pieces of glass, the surplus paste being worked from the centre to the edge with a piece of cloth wrapped over a cork. Great care must be taken that the paper adheres to the glass, no air bubbles being allowed to remain between the glass and the paper. When dry, with a rubber made of a piece of cork covered with the finest glasspaper, work the back of the picture off until there is only a thin film of paper left, care being taken that the paper is not rubbed through to the glass. To get an even thickness, hold the slide up to the light, when the thickest parts will show dark; these spots must be worked carefully off until the whole surface is of an even transparency. If desired, the picture may now be tinted with transparent colours. The slide is now burshed over with a varnish made of equal parts of Canada balsam and spirit of turpentine, and, when dry, mounted in the usual way. With care during the process these slides will almost equal photographic once both in transparency and sharpness.

The half- tone prints taken from phot (graphs make excellent Another simple method when hymns or diagrams for educational purposes are to be thrown on the sheet, is as follows: First get some ground glass cut size. Draw the diagram, or write the hymn in a circle 3 in. in diameter on paper. Lay the glass on drawing, or writing, ground side upwards, trace over the lines with a sharp-pointed F pencil, or with Indian ink, using a small mapping pen. Float with the Canada balsam varnish by holding the glass at one corner, pour the varnish on the centre, spread i rocking the glass backwards and forwards until the whole of the glass is covered, and drain off the back into the bottle at one corner. When dry the slid ready for mounting.