462 SOUTHERN FIELD CROPS 



downward. Injury can be prevented by planting only 

 stems from plants that are entirely free from this disease. 



LABORATORY EXERCISES 



1. In ease cassava steins can be obtained, drawings should 

 be made showing 



(a) how the stems branch; 



(6) locations of leaf soars and buds. 



2. In a region where this plant is grown students should 

 inspect a cassava '" seed-bed " and should participate in, or at 

 least observe, any processes of propagation, cultivation, or 

 harvesting which may be in progress at the time. 



LlTEHATURE 



Stockbkidge, H. B. Cassava as a Money Crop. Fla. Expr. 



Sta., Buls. Nos. 35 and 49. 

 Wiley, H. W. Sweet Cassava. U. S. Dept. Agr., Bur. Chem., 



Bui. No. 44. 

 •Wiley, H. W. The Manufacture of Starch from Potatoes and 



Cassava. U. S. Dept. Agr., Div. Chem., Bui. No. 55. 

 Tracy, S. M. Cassava. U. S. Dept. Agr., Farmer's Bui. 



No. 167, and Bailey's Cyelo. Agr., Vol. II, pp. 227-229. 

 Moore, C. C. Cassava : Its Content of Hydrocyanic Acid and 



Starch. U. S. Dept. Agr., Bur. Chem., Bui. No. 105. 



