THE LuESTHER T. MERTZ LIBRARY 



THE NEW YORK BOTANICAL GARDEN 

 AN INTRODUCTION TO 



BACTERIAL DISEASES 

 OF PLANTS 



BY 



ERWIN F. SMITH 



In Charge of Laboratory of Plant Pathology, 

 Bureau of Plant Industry, 

 United States Department of Agriculture, Washington, D. C. 



Member of the National Academy of Sciences and of the American Academy of 

 Arts and Sciences; Fellow of the American Philosophical Society; Ex-President: 

 Society for Plant Morphology and Physiology (1901), Society of American 

 Bacteriologists (1906), Botanical Society of America (1910K American Phyto- 

 pathological Society (191 7), etc. 



Ecrire I'histoire d'une science nouvelle, c'est se voiier 

 a d'eternels recommencements. — Madame Duclaux 



PHILADELPHIA AND LONDON 



W. B. SAUNDERS COMPANY 



1920 



