pOO C. .11 DSON HERRICK 



doubtedly olfaction. Nevertheless cerebral cortex is not devel- 

 oped under the influence of any single sensory system, no matter 

 how elaborately organized, and it is probable t hat the primordium 

 bippocaii pi, even in selachians and amphibians, is concerned with 



the correlation o( all o( the various types of afferent impulses 

 which roach the cerebral hemisphere in those animals. 



These considerations permit the formulation of a provisional 

 definition of cerebral cortex (p. -191) and surest some modifica- 

 tions of the BNA subdivision of the prosencephalon (p. 494). 



