2 



hy drought. But generally a sufficient rainfall can be expected for the 

 needs of a plant as hardy as sorghum. 



West of central Kansas the question of rainfall is as important as 

 that of temperature. Irrigation is already showing its value in the arid 

 regions of the West, and there are many reasons for expecting to see 

 areas now almost bare of vegetation become valuable sugar plantations 

 under its influence. 



A more extended description of the charts is not necessary. Their 

 value will be found chiefly in the method of study by which they are 

 interpreted. Tliis method will depend largely on the local circum- 

 stances of the sugar grower and manufacturer. 



