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MoINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., U. S. A. 45 enable the instructor to prepare, as needed, specimens of the vegetable and insect world, as they exist in his immediate vicinity. Geological specimens such as crystals of quartz, feldspar, mica, pyrites and other minerals, may be shown as well as diagrams or maps, of various strata, formations, etc. Botanical specimens, especially the structure of plants, the germs and minute forms of vegetable life, offer an infinite variety of objects suitable for projection. It is impossible to do more than to refer briefly to a few of the applications of Projection Apparatus, the field of its usefulness extends to every branch of science. With our Solar Combination it is possible to magnify an object one thousand diameters or a million areas, and still have it so well lighted that a large audience can see it plainly. A view of any given locality may be displayed, and the flora or fauna be projected upon it. The microscopic organisms can be shown on a large field, which affords opportunity to study their actual life, surrounded by their natural media. List of Articles suitable for Projection. Hairs of ani- mals, held between two pieces of glass ; down from wings of moths and butterflies, (these adhere to glass without pressure) ; scales of fishes ; eyes, legs, wings of flies; whole insects; stings of bees and wasps; antennae of moths and mosquitoes; fibres of cotton, wool, silk, linen, ferns, mosses, lichens, leaves of trees ; thin sections of wood ; small flowers, stamens, pistils, pollen, seeds ; mites in cheese ; vinegar and paste eels; butterflies, beetles; animalcules in stagnant water; crystallization of camphor, indigo; sulphate of copper; diatoms; mould, and most microscopic preparations. Suitable ob- jects may be found everywhere; in stagnant pools, in vases where flowers have remained a day or two ; an infusion of hay; in most fermented liquids. The larva of a mosquito is a lively and amusing thing when magnified five or six feet in length. Histological research may be facilitated, and its results exhibited on a large scale. Miscellaneous Subjects that may be Illustrated by Pro- jection. Porosity, cohesion, divisibility of matter, capillarity; crys- tallization, as in ice flowers, lead, tin or silver trees; gravitation; acoustics ; reflection and refraction of light; chromatic abberration ; rainbow, mirage; dispersion; Newton’s rings; recomposition of white light; absorption bands ; spectrum analysis ; fluorescence ; polariza- tion of light; diffraction ; formation of clouds ; maximum density of water: galvanometer, calorescence, magnetism, diamagnetism, elec- tricity; decomposition of water ; heating by the electric current; acid and alkaline reactions; precipitation; equilibrium of liquids;