THE PHOTOGRAPHIC NEWS. VoL. XXVII. No. 1305.—September 7, 1883. CONTENTS. PAGR Medico-Photography Silver Prints Mounted on Glass : Medallions, and how to Pro- dur j them Hutinet’s Gelatino-Bromide Paper Eastman’s Apparatus for Coating Plates with Emulsion Recording Speech by Photography Comparative Emulsion Experiments. By J. Vincent Elsden, B.Sc. (Lond.), F.C.S Report on the Progress of Photography. By J. T. Taylor Dr. Vogel on Sensitometers Notes Patent Intelligence 561 562 563 564 564 564 566 567 567 569 PAGE The Return Journey of the Eclipse Expedition. By C. Ray Woods - Dr. Vogel’s Address at the Milwaukee Convention A Dictionary of Photography Instantaneous Photography Note on Albumenized Paper. By M. Schlier Correspondence Proceedings of Societies Talk in the Studio To Correspondents 76 The Photographic News Registry 576 Photographs Registered 576 571 572 573 573 573 574 575 MEDICO-PHOTOGRAPHY. The analysis of movement by means of photography has made one more step in advance. As our readers know very well, already two important methods of photographing motion are before the public; the first is that of Mr. Muybridge, who employed for the purpose a row of cameras in front of which a horse galloped, the horse, by means of threads stretched across his track, exposing the cameras instantaneously one after another; and the second example is that of M. Marey, of the French Academy, who employs only one camera, but photographs the moving object in various parts of the sensitive plate, successive exposures of the lens being brought about by a cog-wheel revolving in front of the lens. In the case of M. Marey’s process, a black background is used, the moving object being white, and in this way the image may impress itself in a dozen different positions on the plate, while the back ground leaves no record of itself at all behind. A third method has now been suggested by Professor Fig. 1.—Doctor and Patient. Showing apparatus in position for observing a patient. Charcot, of the Saltpetiiere Hospital, in Paris, a gentle man who has made good use of photography in recording the progress of disease in his patients. Professor Charcot’s object was to obtain some record of the rapid changes that come over a patient suffering from hysteria or epilepsy, or, indeed, any disease of a nervous character, the attacks upon the invalid in these cases being composed of perfectly distinct periods, each consisting of a succession of rhythmi cal and characteristic changes. His desire was to de compose, so to speak, his patient’s movements, and to secure the various phases by photography. As neither the method of Muybridge nor of Marey was applicable, an apparatus of original design had to be constructed. This M. Charcot has done; his camera is fitted in front