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ACKNOWLEDGMENT 
The writer wishes to acknowledge the kindly advice and helpful sug¬ 
gestions made by Dr. F. A. Wolf during the progress of this work. He also 
wishes to express his appreciation to Mr. Charles Hearing, Assistant Director 
of the Coastal Plain Station, Mr. R. E. Currin, Jr., Asistant Director of 
Edgecombe Station, Mr. F. T. Meacham, Assistant Director of the Piedmont 
Station, and Dr. W. W. Faison, Superintendent of the State Hospital for 
Negro Insane at Goldsboro, N. C., for their interest in the field tests con¬ 
ducted under their supervision. 
