EXPERIMENTAL BIOLOGY SERIES 



Editors: Philip Bard, Johns Hopkins University; L. R. Blinks, 

 Stanford University; W. B. Cannon, Harvard University; W. J. 

 Crozier, Harvard University; J. B. Collip, McGill University; 

 Hallowell Davis, Harvard University; S. R. Detwiler, Columbia 

 University; Selig Hecht, Columbia University; Hudson Hoagland, 

 Clark University; J. H. Northrop, Rockefeller Institute for Medical 

 Research; G. H. Parker, Harvard University; Gregory Pincus. 

 Harvard University; L. J. Stadler, The University of Missouri; 

 Sewall Wright, University of Chicago. 



PACEMAKERS IN RELATION TO ASPECTS 

 OF BEHAVIOR. By Hudson Hoagland 



NEUROEMBRYOLOGY. By Samuel R. Det- 

 wiler 



THE EGGS OF MAMMALS. By Gregory 

 Pincus 



Other volumes to follow 



