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The papers included in this pamphlet will be of interest to biologists generally, and some are of special importance to medical men. The president's address traces in an entertaining way the evolution of the projection microscope, beginning with the making of spectacles in the thirteenth century, since spectacles were the predecessors of other optical instruments. This historical study is accompanied by full bibliographic references, much enhancing its value. The first article of special interest to the physician is a list of invertebrates noxious to man collected by F. C. Wellman in Portuguese West Africa. The list includes protozoa, worms and insects, the two last classes not being strictly microscopic, but requiring that instrument for their identification. J. H. Powers, in "Further Studies in Volvox," touches the question of sex-differentiation for the study of which he regards this animal as especially suited. "Data for the Determination of Human Entozoa," by H.
Transactions of the American Microscopical Society. JAMA. 1909;LII(16):1280. doi:10.1001/jama.1909.02540420060024
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