The Quarterly Review of BiologI 



MARCH - JUNE - SEPTEMBER - DECEMBER 

 RAYMOND PEARL, Editor 



Institute for Biological Research 

 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 I 



ANTHROPOLOGY A. L. Kroeber University of California 1 



BEHAVIOR AND COMPARA- 

 TIVE 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. Conklin Princeton University \ 



EXPERIMENTAL MOR- 

 PHOLOGY Ross G. Harrison Yale University 



GENERAL PHYSIOLOGY /Lawrence J. Henderson 



IG. H. Parker Harvard University 



GENETICS P^* ^" Emerson Cornell University 



' IT. H. Morgan Columbia University 



GEOGRAPHICAL DISTRIBU- 

 TION AND TAXONOMY Alex. G. Ruthven University of Michigan 



PALEONTOLOGY John C. Merriam Carnegie Institution 



ZOOLOGY Frank R. Lillie University of Chicago 



Interesting Papers to Appear in Early Numbers 



Life Zones. E. W. Nelson, Bureau of Biological Survey, U. S. Department of Agriculture. 



The Cytology oe Glandular Secretions. R. H. Bowen, Columbia University. 



Facial Expression. Ernst Huber, Johns Hopkins University. 



The Problem of Senescence and Rejuvenescence in the Protozoa. L. L. Woodruff, 



Yale University. 

 Natural Hybrid Trees. John G. Jack, Arnold Arboretum. 



Experimental Studies of Bird Malaria. R. W. Hegner, Johns Hopkins University. 

 Respiration in the Insects. M. O. Lee, Memorial Foundation for N euro-Endocrine Re- 

 search. 

 Mendelian Inheritance in Fish. H. B. Goodrich, Wesleyan University. 



Copyright 1928, The Williams & Wilkins Company 



Entered as second-class matter January 27, 1926, at the post office at Baltimore, Maryland, under the Act of March 3, 1876. 



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Made in United States of America 





