370 Journal of Agricultural Research voi. xv, no. 7 



Jay A. Bonsteel, Soil Specialist of the Bureau of Soils, seemed to exclude 

 faulty drainage from the list of possible causes. 



The studies reported in this series of papers were carried out in coop- 

 eration with the Office of Cotton, Truck, and Forage-Crop Disease Inves- 

 tigations and with the Virginia Truck Experiment Station. From both 

 organizations highly appreciated help was received. The writers are es- 

 pecially indebted to Mr. J. A. McClintock, then Pathologist at the Vir- 

 ginia Truck Experiment Station. He took notes on field conditions, 

 selected and prepared authentic material for laboratory study, and aided 



in many other ways. 



It is believed that this biochemical study of a "mosaic" disease will 

 perhaps have fully as great an interest for plant pathologists as for 



physiologists. 



Rodney H. True, 



Physiologist in Charge of Plant Physiological 



and Fermentation Investigations. 



