LABORATORY EXERCISES 



IN 



PRINCIPLES of 

 AGRICULTURE 



BY 

 ERWIN HOPT, B. S. . 



Associate Professor of Agronomy, University of Nebraska 



LINCOLN, NEBRASKA 



and 



RUSSELL R. SPAFFORD, B. S. 



Assistant Farm Management Demonstrations, University 

 of Nebraska; cooperating with United States Department 

 of Agriculture. (Formerly Instructor in Agronomy, 

 State School of Agriculture, Curtis, Nebraska) 



W. M.Welch Manufacturing Company 



including 



W. M. Welch Diploma House and 

 W. M. Welch Scientific Company 



Publishers ami Manufacturers of Everything for Schools 



1516 Orleans Street - - - Chicago III, U. S. A. 



