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138 SCIOPTICON MANUAL. the color with the brush after it is once applied, so we must be able to do what we wish with a very few bold strokes. We don't mind about trees, spires, &c., we can take the sky tint off from them where we wish to do so afterwards (before the color is dry) with a sable brush, slightly moistened with ol. turpentine, but the brush must not contain enough to spread at all on the surface, otherwise the color will flow away from the line we wish to establish, and form a ridge on the sky. A better way to apply sky tints is to stipple or daub the surface with a little paint on the end of the finger. In this way all the finest skies are painted by the best artists who make pictures for the magic lantern, but the process is one that can only be learned by many trials and much practice. After the sky is painted and removed from places where it is not wanted, distant hills next receive our attention, successively working upon objects nearer and nearer, until the whole picture has received its first painting. Except for skies the colors will not need thinning with ol. turpentine. The picture should now be put out of the way of dust and sunshine, and where it will dry. The next day such parts as need can be repainted, and, if necessary, any successive number of coats can be applied, allowing a day between each for the paint to dry. When com- pleted, it only remains to put on a mat and cover and fasten the edges with paper strips. Flour paste (too stiff to allow moisture to be drawn up between the plates) is the best. When in use, that is when changing from one color to another, the brushes can be cleaned with ol. turpen- tine. But when the brushes are to be put away, they should be washed with warm water and soap, rinsed with dean water, and then brought to a point to dry.