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At the last meeting of the Anthropological Institute, Dr. Garson exhibited a series of photographs of cases of hypertrichosis. It is rather singular that one of the uses to which, in the very earliest days of photography, it was thought the art would be specially adapted should be medical science. Sir John Robinson, Secretary to the Royal Society of Edinburgh, in speaking before the Society of Arts in 1839 on Daguerre’s discovery, which had been announced to the world but a short time previously, said : “ In one department it will give valuable facility. Ana tomical and surgical drawings, so difficult to make with the fidelity which it is desirable they should possess, will then be easily produced by a little skill and practice in the disposition of the subjects and of the lights.” This was said forty-four years ago; yet how little, comparatively speaking, has photography been utilised by the medical profession! Is there a single work on physiology, patho logy, or anatomy in existence which is illustrated by photographs? If so, we should be glad to hear of it. The Royal College of Surgeons almost ignores photo graphy. It has gone to an enormous expense in the pre paration of an elaborate series of drawings illustrative of every form of skin disease, but not a single photograph can be found; and this, too, in a department for which photography is peculiarly suitable. Of course, in regard to colour, these drawings are of great value, but in accu racy of form they surely cannot compare with photo graphs. Evidently spurred on by the recent photo-balloon experi ments of the German War Office, our military authorities at home have resolved upon undertaking some trials of a similar nature during the summer. There is no doubt much has to be accomplished in balloon-photography, and if only those who have experience on the subject were con sulted, some useful information might result. It is not generally known that one of the best scientific authorities —if not the best—on ballooning is the president of the Photographic Society, Mr. James Glaisher, F.R.S. ‘ Mr. Glaisher enjoys the enviable reputation of having been nearer heaven than any other man. During his numerous voyages, he has risen to a distance of seven miles above the earth, and, as a wonderful instance of what might be depicted by a camera at great altitudes, Mr. Glaisher tells us that on one occasion the whole breadth of England could be seen at a glance, as on a map, the coast at Norfolk being recognised on the one hand, and the Welsh sea-line on the other. One of these days, perhaps, we shall have maps made by photography in this way. patent Entelligence. Application for Letters Patent. 1380. Richard Brown, and Robert William Barnes, and Joseph Bell, all of the city of Liverpool, in the county of Lancaster, for an invention of “Improvements in and relating to the preparation of pictures and photographs to be used in the production of pictures by the art of photography and photo-engraving, and in the production of gelatine reliefs and printing surfaces therefrom.”.—Dated loth March, 1883. Notice to Proceed. 843. Thomas Samuels, of Monken Hadley, in the county of Middlesex, for an invention of “ Improvements in apparatus for holding dry plates or films before, during, and after expo sure, and for changing them in the photographic camera.”— Dated 15th February, 1883. TWELVE ELEMENTARY LESSONS ON SILVER PRINTING. Lesson V. In lesson No. III. we learnt the meaning of the term sensi tized paper—what it is, and how to prepare it ; we also considered the darkening action which would take place if the paper be exposed to daylight. For this reason, only yellow light should be used in the printing apartment when the sensitive paper is uncovered, because the delicate whites of the print will not be found to suffer in the slightest degree by the continued action of such alight. Our next operation will be to place some of this sensitive paper on a negative, in a suitable frame, and print an impression thereon. The accompanying sketch A indicates what is called the printing or pressure frame, such as usually employed for negatives up to 6} by 44 inches (half-plate), attaching a label or tablet, as shown, with the number of prints required, and placing one stroke beside it each time the frame is re-charged; this forms a convenient mode of registering the number of prints executed. Perhaps a better plan may suggest itself to many, such as attaching a label permanently to the negative, narrow strips of albumenized paper being well suited for the purpose. The sketch B is provided with a plate-glass bed whereon the negative is laid, so that any smaller sized negative than the plate-glass may be printed in it. As a rule, however, they are usually employed for the larger sizes only. When the frame is open, light is free to passthrough; but when closed, as in the sketch, light can only pass through the negative on to the sensitive paper. The back is made in two halves hinged together, so that the pressure may be retained on one-half, while the other half may be opened to examine the progress of printing. Very little