The Quarterly Review 

 of Biology 



Raymond Pearl, Editor 



The Johns Hopkins University 



ASSISTED BY 



R. W. Hegner Blanche F. Pooler John Rice Miner 

 Contributing Editor Assistant Editor Assistant Editor 



The Johns Hopkins University 



ADVISORY BOARD 



ANATOMY Lewis H. Weed The Johns Hopkins University 



ANTHROPOLOGY A. L. Kroeber University of California 



BEHAVIOR AND COMPAR- 

 ATIVE PSYCHOLOGY . . . . K. S. Lashley University of Minnesota 



BOTANY Irving W. Bailey Harvard University 



CYTOLOGY Edmund B. Wilson Columbia University 



ECOLOGY William Morton Wheeler Harvard University 



EMBRYOLOGY E.G. Conkxin Princeton University 



EXPERIMENTAL 



MORPHOLOGY Ross G. Harrison Yale University 



GENERAL PHYSIOLOGY j Lawrence J. Henderson 



( G. H. Parker Harvard University 



JR. A. Emerson Cornell University 



(R. A. ] 

 {T. H. ] 



. Morgan Columbia University 



GEOGRAPHICAL DISTRI- 

 BUTION AND TAXON- 

 OMY Alexander Ruthven University of Michigan 



PALEONTOLOGY John C. Merriam Carnegie Institution 



ZOOLOGY Frank R. Lillie University of Chicago 



