Acknowledgement 



The authors wish to express their gratitude to the following 

 members of the New Hampshire Agricultural Experiment Station 

 and the USDA Soil Conservation Service for their valuable review 

 and criticism of this bulletin: New Hampshire Agricultural Experi- 

 ment Station — Ford S. Prince, Agronomist; Bertram Husch, 

 Associate Forester; Harold C. Grinnell, Director. USDA Soil Con- 

 servation Service — Walter H. Lyford, Field Soil Correlator; 

 Kenneth E. Grant, Soil Conservationist, State Program Servicing 

 Staff; Allan J. Collins, State Conservationist; Isabel M. Langis, 

 Clerk-Stenographer; Ruth A. Fernald, Secretary. 



Cover photograph l>y Henry W. Corrow Jr., Cooperative 

 Extension Service, University of New Hampshire 



APRIL 1956 



