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44 mcintosh battery and optical co„ Chicago, ill., 0. s. a. presented in a new light. It became a pleasure rather than a task to study it. On beholding for the first time a drop of water under a microscope he was astonished at seeing the myriads of living forms, it opened to him a new world of wonders and new desires to study ; that boy, though too poor to purchase a microscope at the time, never neglected an opportunity to learn what he could in the department of microscopy, and was never satisfied until he was owner of the coveted prize. The above reference is made simply to show that ideas con- veyed to the mind through the eye produce an impression as much stronger on the mind as reality is stronger than a dream. We forget common conversation, descriptions of places and things, but when we visit them, and their forms are conveyed to our mind through the medium of our eyes, they are indelibly impressed on our memor) This is the reason why object teaching yields such grand results. Many children cannot retain ideas which they receive through the medium of books, but when they are accompanied with illustrations the mind easily comprehends the description and retains it. A want has long been felt by teachers and scholars for some way to illustrate without costly charts and maps, which occupy so much space and are so easily destroyed. This want has been fully met by Dr. McIntosh’s Solar Microscope and Stereopticon Combination. Lessons in drawing may be given by copies prepared upon glass by the teacher, and the light of the room may be sufficient to permit the pupils to work. Geography, usually so dry and uninteresting to pupils, may be made not only instructive but amusing, by accompanying the text book lessons on the various countries with well selected views of the prominent points of interest, the inhabitants, their customs, occupa- tions, architecture, manufactures, and products of the soil. Natural history may be illustrated by views of birds, rats, mice, squirrels, frogs, toads, live fishes in tanks with transparent sides. The classifications, resemblances and differences existing in the animal kingdom may be made plain by life-like representations of the various objects of study, more conveniently even than when access can be had to well stocked museums, which are unfortunately too rare to supply the needs of the mass of pupils engaged in studying these subjects. Tire demand of instructors for illustrations on these subjects have led the manufacturers of slides to provide a large assortment, which represent almost all the phenomena that are required for school room or college purposes. Special slides to illustrate additional points can be made to order, and glass cells furnished at small cost, which will