No. 472. Yield and persistency were 

 investigated by N. K. Peterson and P. 

 T. Blood, and nutritive value by N. F. 

 Colovos, H. A. Keener and H. A. Davis. 



Growth chambers for better control 

 of temperature, light and humidity in 

 basic research with plants were de- 

 signed and constructed by A. B. Prince 

 and P. T. Blood. 



When R. L. Donahue resigned as 

 head of the department in 1956, A. B. 

 Prince was appointed to replace him. 

 Prince continued as head until 1963 

 when he transferred from Agronomy 

 to the new Soil and Water Science 

 department, and Agronomy merged 

 with Horticulture. 



Animal Science 



Emphasis during Tirrell's tenure was 

 placed on teaching and extension ac- 

 tivities. G. L. Smith and H. E. Kimball 

 were the other members of the de- 

 partment. 



Botany 



A. E. Rich studied black root rot, a 

 serious disease of strawberries, and 

 showed it to be partly due to nema- 

 todes. Apple scab is a fungus disease 

 known for approximately 100 years. 

 Rich tested new organic fungicides 

 and varied spray schedules, searching 

 for more effective control of this 

 pathogen. He and pathologists at the 

 University of Maine collaborated on a 

 bulletin entitled, "Apple Virus Dis- 



A. B. Prince studies the movement of water in soils and plants by radioactive tracers 



34 



