The Transmission of Nervous Impulses 

 in Relation to Locomotion 

 in the Earthworm 



John P. Bo vard 



A thesis presented to the faculty of the 

 College of Letters and Science 



in the 



University of California 

 in partial fulfillment of the requirements 



for the degree of 

 Doctor of Philosophy. 



Approved by subcommittee in charge 



. Chairman 



Berkeley, California. 



