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SCIOPTICONMANUAL. 83 and pasted on the glass. Glass may be smoked or cov- ered with opaque paint, and diagrams scratched upon it with a needle-point or sharp knife; the light passing- through these lines appearing on the screen as a white chalk diagram on a blackboard. Still another way of preparing diagrams is to dissolve gelatine, such as is used in cooking; strain, and pour it over the glass, form- ing a thin film on its surface. When this is dry, the dia- gram is scratched on as before, and soft lead rubbed over the lines. Mottoes may be photographed on glass, and then colored, or the designs drawn with the pen or brush, and colored. The Sciopticon is extremely well adapted for experi- ments and amusements, as its front lens can be drawn out, giving ample space for the introduction of figures and such like. Small china and wooden dolls, with but slight tissue-paper dress, may be made to twirl or move about in many curious ways; those with perfect faces are the best. They of course must be suspended by a silk or wire attached to the feet; but a hint is sufficient. Lizards, fish, and insects in the tank are always pleasing because they move. When one has but few slides, the entertainment may be varied by introducing some of the home-made objects, thus affording much amusement, with but slight expense and trouble. CHAPTEE VII. CHEMICAL EXPERIMENTS. CONTRIBUTED BY PROF. HENRY MORTON, Ph. D. President of the Stevens Institute of Technology, Hoboken, N. J. IN addition to the use of the magic lantern in its original office of exhibiting pictures, it will admit of a great variety of applications which enable the operator