U. S. DEPARTMENT OF AGRICULTURE 



BUREAU OF PLANT INDUSTRY -BULLETIN NO. 104. 



K. T. GALLOWAY, Chief of liunaii. 



THE USE OF FELDSPATHIC ROCKS 



AS FERTILIZERS. 



BY 



ALLERTON S. CUSHMAN, 



Assistant Dikectok, Office of Public Roads, and 

 Collaborator, Bureau of Plant Industry. 



Issued May 27, 1907. 



WASHINGTON: 



GOVERN3IENT PRINTING OFFICE. 



1907. 



