Acknov/ledgment 



To list those to whora grateful acknowledgment is due 

 for reviewing data, checking costs, and for valuable suggestions, 

 would result in a formidable array of names ranging thru growers, 

 fieldmen, markatmen , farm advisers, horticultural commissioners 

 and members of the College of /.griculture of the University of 

 California. 



All are entitled to recognition and an expression of 

 deep appreciation for the aid ro cheerfully given. In many in- 

 stances much time, effort and care was unstintedly forthcoming. 



FolloT-ing the collection of the original data, the re- 

 quirements for grov;th and costs of production have been checked 

 and rechecked to the extent of over 300 times for requirements and 

 nearly 300 times for ccsts. 



The data herewith presented represents the final summary 

 of all ?/ho have v/orked v/ith me in its compilation. 



R. L. Adams 



