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1Museum of Zoology, University of Michigan, Ann Arbor.
2Associate in Physical Optics (with Dr. Ralph H. Pino), David Whitney Building, Detroit, Michigan.
*
This work was commenced under an Alfred H. Lloyd Fellowship held by the senior author at the University of Michigan in 1931-32 and completed during his tenure of a National Research Fellowship, 1932-33. Sincere thanks are herewith expressed to the administrators of these fellowships for the opportunity to make this investigation.