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THE STATE OF KNOWLEDGE

GORDON L. WALLS, Sc.D.

Arch Ophthal. 1934;12(6):914-930.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

The present seems a favorable time to take stock of the knowledge, theories and impressions of the visual cells and their mode of operation. Advance in the histology of the human retina practically ceased with the publication of Greeff's classic monograph in 1900, but photochemical and photophysical theorization as to the nature of the visual process continue. So many ideas in circulation at present have their basis in real or supposed cytologic features of the visual cells that there is need for a reexamination of these features and for indications as to what still needs badly to be done, histologically, to enable one to eliminate some of these conflicting ideas and prepare one to consider the next crop.

It is hoped, then, that the reader who is familiar with the principal reference books and interested in current theory will find here some aid in developing a defense against the plausible. . . . [Full Text PDF of this Article]

Author Affiliations
IOWA CITY

From the Department of Zoology, State University of Iowa.

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