Dept. 



LETTER OF TRANSMITTAL 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF CHEMISTRY, 

 Washington, D. C., October 16, 1909. 



SIR : I have the honor to submit for your approval a report on the 

 composition of commercial and "home-made" lead arsenates, 

 together with the results of two years' experimental work on the 

 action of this insecticide on foliage, especially that of the peach tree. 

 The problems and conditions discussed are of vital interest to all 

 orchardists and farmers, and I recommend the publication of the 

 report as Bulletin 131 of the Bureau of Chemistry. The work was 

 performed in the insecticide and fungicide laboratory of the Miscel- 

 laneous Division of this Bureau, with the cooperation of the Bureau 

 of Entomology. 



Respectfully, H. W. WILEY, 



Chief of Bureau. 

 Hon. JAMES WILSON, 



Secretary of Agriculture. 



