CONTRIBUTIONS FROM THE 



BOTANICAL LABORATORY 



OF THE UNIVERSITY OF PENNSYLVANIA 



Vol. IV. No. 1. 



THE SWEET POTATO 



BY 

 B. H. A. GROTH, A.B., Ph.D. 



LIBRARY 

 NEW YORK 

 BOTANICAL 



QAKUfsiN. 



UNIVERSITY OF PENNSYLVANIA 

 D. APPLETON AND COMPANY, Agents, NEW YORK 



1911 



