U. S. DEPARTMENT OF AGRICULTURE. 



BUREAU OF PLANT INDUSTRY BULLETIN NO. 22. 



H. T. GALLOWAY, Chief of Bureau. 



INJURIOUS EFFECTS 



OK 



PREMATURE POLLINATION; 



WITH 



GENERAL NOTES ON ARTIFICIAL POLLINATION AND 



THE SETTING OF FRUIT WITHOUT 



POLLINATION. 



BY 



CHARLES P. HARTLEY, 

 Assistant in Physiology. Plant-Breeding Laboratory. 



VEGETABLE PATHOLOGICAL AND PHYSIOLOGICAL 

 INVESTIGATIONS. 



Issued October 4, 1902. 



LIBRARY 

 NEW YORK 

 BOT\i\rCAL 



ARf 



WASHINGTON: 

 government printing office. 



1902. 



