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514 P. E. TRUESDALE [j. s. M. P. E.
of the masters of this early period and viewing in particular the contributions of Galen, especially his volumes, On Anatomical Achievement, one is amazed at the extent of his teachings on a background of pictorial illustrations. Anatomical pictures form the bulk of his material for instruction. The great teachers of the middle ages used the pictorial art to an even greater extent. Thus throughout antiquity from the original medical hieroglyphics on stone as early as 16,000 B.C. medical knowledge has been handed down on papyrus, metal, limestone, soapstone, talc, clay, bone, and copper plates. The advent of motion portrayal marked a new epoch in the progress of science and in the history of photography. While its field of utility has been limited largely to aesthetic purposes, business men have been alert to its great value in placing commodities before the public.
In spite of the fact that life is synonymous with motion and that every part of the human body is in a state of growth or degeneration, motion picture illustrations in medicine with few exceptions have been limited to demonstrations of deformities of the extremities. The medical profession, therefore, is only beginning to make use of motion photography as a scientific means of conveying impressions of living processes with greater accuracy and effect. The reasons for this delay are obvious. The preparation of a medical subject for motion picture recording is a time-consuming experience. Often, it requires actual tests to determine the adaptability of the subject in mind. These are frequently disappointing and more than likely to entail considerable expense. While the doctor in the preparation of his picture has contributed time, labor, and money, he has not been able to find reimbursement to help in the production of the next picture. The medical author is remunerated to some slight extent for his contribution in medical books, but single articles for medical periodicals are prepared and published without any expectation of monetary return. These manuscripts and illustrations, however, are comparatively inexpensive to produce. The doctor gives as much of his time to his article as he can reasonably afford. Preparation and publication are carried out in line with tradition. The advent of sound pictures bids fair to alter relationships in the methods of transmitting medical knowledge. Just as it has greatly embarrassed a theatrical industry, thought to be established for some time to come, so it is likely to make inroads upon the orthodox methods of teaching medicine.