xii AUTHOR'S PREFACE. 



If each treatise is to be complete in itself, the 

 methods of growing these respective crops must be 

 given in both, and this necessitates some repetition. 

 It has been, and will be, the constant aim of the 

 author, however, to avoid such repetition to the 

 greatest possible extent. By combining two or more 

 separate treatises in one, repetition could be almost 

 entirely avoided, but the purchaser would then have 

 to pay for matter in which he might not be interested 

 in order to obtain that which was of special interest 

 to him. Of the two plans, the author believes that 

 he has chosen that which will be more advantageous 

 to the general public. 



University Experiment Farm, 



St. Anthony Park, Minn., 1900. 



