AGRICULTURAL HISTORY AND DISTRIBUTION OF SORGHUM. 9 



ment. The wild species is found abundantly in all tropical and 

 subtropical parts of the Old World (fig. 1). It has been quite 

 carefully studied by agriculturists and botanists in India, and to a 

 lesser extent in tropical Africa. Its forms are numerous and the 



main lines of variation are parallel with those represented by the 

 major groups of cultivated varieties. This is especially noticeable 

 in comparing the forms assumed by the wild and the cultivated spe- 

 cies in Africa, and to a lesser extent in India also. The abundant 

 22578— Bui. 175—10 2 



