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22 MCINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., D. 8. A. McIntosh combination stereopticon. PRICE, complete in neat packing- case 21 inches long, 9 '/, inches wide, 13J4 inches high, with lock and handle $100.00 Without brass front, condensers and lens $50.00 The base of this handsome apparatus is an open frame of iron, ornamented with japan and gilt, with nickel plated legs 4 inches long. The body is nickel plated, with hinged door in the side for adjusting the jet and lime, and peep hole P of blue glass, through which the light can be examined without injury to the eyes from its intense brilliancy. The body is also hinged upon the frame, and may be turned back off from the light for convenient manipulation in certain chemical experiments, and also to light the room at the close of an entertainment. The special jet furnished with this Stereopticon is platina tipped; it is shown in detail and described on another page. H and O are stop-cocks through which hydrogen and oxygen are admitted from their respective reservoirs. R is the rod for drawing the light away from the condensers or moving it nearer to them. There is the same general arrangement for ventilation as in the instruments previously described. The solid brass front C can be removed and employed for Solar illumination. It is attached to the body of the Stereopticon by a universal ring, therefore those who are already supplied with our Solar Microscope and Stereopticon Com- bination, and wish to employ artificial light, can obtain the Lantern portion without the necessity of duplicating the optical parts. The opening A is sufficiently wide to admit a variety of physical apparatus employed for demonstrating the phenomena suited to Stereopticon lenses. The lens L may be removed and the Microscope Attach- ment substituted for it. This apparatus was originally designed as