Commissioner of the Dominion of Canada, 

 for the use of certain cuts contained in 

 this book, which are reproduced from 

 "Farm Weeds of Canada," and to Profes- 

 sor H. L. Bolley of the North Dakota 

 Experiment Station for the ilkistration of 

 spraying machinery. 



THOMAS SHAW. 



St. Paul, Minn., Feb. 2, 191 1. 



