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Division on Physics and Biophysical Research, The Mayo Foundation, Rochester, Minnesota, and Professor of Biophysics and Physiological Optics The Graduate School of Medicine, University of Minnesota. *Submitted for publication March 8, 1929. *An abridgment of the material presented before the American Academy of Optometry at Chicago, Ill., December, 1928.
Charles Sheard (Wed,) studied this question.