SOIffi CONETITUEITTS OF THE POISON IVY PLANT . 

 (RHUS TOZICODMDROn) 

 000™ 



BISSERTATION 



—COO 



Submitted to the Board of University Studies of the 

 Johns Hopkins University in Conforniity with the Re- 

 quirements for the Degree of Doctor of Philosophy. 

 By 

 William Anderson Symc. 

 1906. 



