LETTER OF TRANSMITTAL. 



U. S. Department of Agriculture, 



Bureau of Plant Industry, 



Office of the Chief, 

 Washington, D. C, August 2, 1910. 

 Sir : I have the honor to transmit herewith a paper entitled " Di- 

 morphic Branches in Tropical Crop Plants: Cotton, Coffee, Cacao, 

 the Central American Rubber Tree, and the Banana," by Mr. O. F. 

 Cook, Bionomist of this Bureau, and to recommend its publication as 

 Bulletin No. 198 of the Bureau series. The paper shows that each 

 plant produces two different kinds of branches, and points out 

 numerous agricultural applications of these specialized habits of 

 growth. 



Respectfully, G. H- Powell, 



Acting Chief of Bureau. 



Hon. James Wilson, 



Secretary of Agriculture. 

 198 3 



