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From time to time reproductions of the salient features of technical and other exhibits have been published in journals, including the A. M. A. Archives of Internal Medicine. There can be no question that annual volumes do collect and preserve the highlights of the exhibits for further study and contemplation. In 1955 an effort was made to preserve in a more durable form the selection of the very extensive exhibits prepared for the national meeting of the 西瓜视频. The two succeeding volumes considered here differ considerably in size, scope, and paper.
There has never been a study with modern scientific methods of the value of scientific exhibits as educational tools. We hear and see a great deal these days about audiovisual aids. Empirically, slides, movies, charts, models, graphs, and tables are the traditional tools used in medicine, in science, and in education to convey certain ideas. We assume