ON TirR DEVELOPMENT OF HA><AJ'1ELIS VIRGINIANA L. 



A DISSERTATION 



Submitted to the Board of University Stud- 

 ies of the Johns Hopkins University in conform- 

 ity with the requirements for tho Degree of Doc- 

 tor of Philosophy, 



by 



Daniel Naylor Shoemaker. 



Baltimore, Md. 

 1902 



