LETTER OF TRANSMITTAI, 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF CHEMISTRY, 

 Washington, D. C., December 29, 1906. 



SIR: I have the honor to transmit herewith the results of the chem- 

 ical work performed in connection with the study of the amount of 

 hydrocyanic acid and starch present in cassava. This investigation 

 was undertaken in collaboration with the Bureau of Plant Industry to 

 determine, by the cultivation of different varieties of cassava, which 

 of the varieties contained the largest quantities of hydrocyanic acid 

 and starch, and what were the conditions governing the variation in 

 these constituents, especially the hydrocyanic acid. 



The botanical description of the different varieties of cassava has 

 been supplied by the Bureau of Plant Industry, which imported and 

 propagated the varieties studied at the substations of that Bureau at 

 Miami, Fla., and Biloxi, Miss. 



1 recommend that this report be published as Bulletin No. 106 of 

 the Bureau of Chemistry. 



Respectfully, H. W. WILEY, 



Chief of Bureau. 

 Hon. JAMES WILSON, 



Secretary of Agriculture. 

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