U. S. DEPARTMENT OF AGRICULTURE. 



BDREAU OF PLANT INDUSTRY- BULLETIN NO. 29. 



B T. GALLOWAY, Chief i if llureau. 



THE EFFECT OF BLACK ROT ON TURNIPS: 



A SERIES OF PHOTOMICROGRAPHS, ACCOMPANIED BY 

 AN EXPLANATORY TEXT. 



BY 



LIBRARY 



Nf/vV YORK 



BOTANICAL 



GARDEN 



ERWIX F. S:SIITH, 

 Pathologist, Laboratory of Plant Pathology, 



vegetable pathological and physiological investigations. 



Issued Janvary 17, 1903. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1903. 



