frankly claim, but how well they have been employed in 

 this work it is for the reader to judge." 



In a work of this kind, involving the experience and 

 observation of many individuals during a considerable 

 period of time, it is impossible to render a full account 

 of the writer's indebtedness. Whenever direct use has 

 been made of the experience and methods which others 

 have formulated, an attempt has been made to give defi- 

 nite credit to the source. When such accounts of experi- 

 ence are used without citation of publication credit is in 

 most cases due to the columns of the Pacific Rural Press, a 

 journal which has been the chief medium for publication 

 of information of this kind for the last forty years. 



E. J. WICKSON. 

 University of California, Berkeley, August, 1910. 



