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June 1941

Conos Y Bastoncitos.

Arch Ophthalmol. 1941;25(6):1081. doi:10.1001/archopht.1941.00870120163023

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The first part of the monograph by Sverdlick on cones and rods consists mostly of a comprehensive review of the comparative anatomy of these structures in invertebrates and vertebrates. In addition, it contains the results of original microscopic examinations by the author of the neuroepithelium of primates, ungulates, rodents, aves and reptiles. The ontogenetic development of rods and cones in human embryos of 25 to 200 mm. crown-rump length is treated in the second part of the monograph. The third and last part considers the fully developed human retina.

The author used a great variety of stains, including several silver impregnation methods. There are eighty-two illustrations, the majority of which are photomicrographs. Most of them are instructive ; others fail to fulfil their purpose.

The observations of the author confirm previous reports of the cones and rods of many species. Of greater value, however, are several new descriptions of animals native

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