U.S. DEPARTMENT OF AGRICULTURE. 



BUREAU OF PLANT INDUSTRY BULLETIN NO. 22. 



H. T GALLOWAY, Ctafefof Ituivuii. 



INeiriMOTS EFFECTS 



OF 



PREMATURE POLLIXATIO?; 



WITH 



GENERA! NOTES ON ABTIFICIAI POLLINATION AND 



ITIK SETTING OF FRUIT WITHOUT 



POLLINATION. 



BY 



CHARLES P. HARTLET, 

 Assistant in Physiology, Plant-Breeding Laboratory. 



VEGETABLE PATHOLOGICAL AND PHYSIOLOGICAL 

 INVESTIGATIONS. 



ISSCED < kTOBKR 4. 1902. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1 9 2 . 



