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McIntosh battery and optical co., Chicago, ill., u. s. a. 57 good design and thoroughly well made. Lenses, especially those of high power, ought not to be tested with the use of this accessory. A superior lens, worked by an illustrious microscopist, becomes its maker’s best advertisement. But when it falls into the hands of a careless or incompetent person, and is not carefully used or regularly and properly cleaned, to hold the maker responsible for its consequent unsatisfactory performance is to do him great wrong.” AMATEUR PHOTOGRAPHY. The modern improvements in photography, which are the result of the introduction of gelatine dry plates, has made the photograph- ing of microscopic objects as easy of accomplishment as the photo- graphing of the beautiful and visible in nature is with the popular amateur outfits. The scientist and microscopist, instead of spending hours in making imperfect drawings, aided by the camera lucida, may in a few minutes, with the assistance of photography, produce a more per- fect representation of a minute object than it is possible for the hand of man to do, working conjointly with the eye. Not only can an enlarged image of a microscopic object be formed for illustration, but professors in colleges will find it a ready means to produce negatives of a suitable size from which may be made transparencies or magic lantern slides for exhibition to classes or the public. PHOTOGRAPHIC CAMERA. 3^x4. PRICE $6.50 This Camera is provided with a brass cone B, terminating in the ting C, within which slides the extension tube that fits over the draw tube of our microscopes. A represents the camera box ; D the plate holder, which slides back and forth as desired ; A is a brass bar which is fastened upon the microscope stand to give steadiness to the camera.