U. S. DEPARTMENT OF AGRICULTURE. 

 BUREAU OF PLANT INDUSTRY— BULLETIN NO. 198. 



B. T. GALLOWAY, CMef of Bureau. 



DIMORPHIC BRANCHES IN TROPICAL 



CROP PLANTS: 



COTTON, COFFEE, CACAO, THE CENTRAL AMERICAN 

 RUBBER TREE, AND THE BANANA. 



BY 



O. F. COOK. 



Issued January 14, 1911. 



WASHINGTON: 



GOVERNMEXT PRINTING OFFICE. 

 1911. 



