256 THE FORAGE AND FIBER CROPS IN AMERICA 



determines the size of the gall, the hatching of eggs and spread of new 

 tiematodes increasing the size. The galls resemble the swellings caused by 

 clubfoot in cabbage, from which they may be distinguished in cross-section 

 under the microscope by eggs, larvae, or cysts of the nematodes in some stage 

 of development. The life cycle is said to require about one month. 



320. COLLATERAL READING. Alva Agee: The Cowpea in the North. Penn- 

 sylvania State Dept. Agr. Bui. No. 130, 1904. 



North Carolina Horticultural Society: The Cowpea. Experiment Farm, 

 Southern Pines, N. C.: The Society. 



F. Lamson-Scribner: Southern Forage Plants. U. S. Dept. Agr., Farmers' 

 Bui. No. 102 (1899), pp. 33-7. 



Jared G. Smith: Cowpeas. U. S. Dept Agr., Farmers' Bui. No. 89, 1899. 



C. L. Newman: Cowpea Experiments. Arkansas Station Bui. No. 77, 1903. 



J. F. Duggar: Cowpea Culture. Alabama Station Bui. No. 118, 1902. 



J. B. Killebrew: Grasses and Forage Plants. Tennessee Station Bui. Vol. XI 

 (1898), Nos. 2, 3, and 4, pp. 95-99, 108-111. 



