PREFACE. 



deavored always to give credit to other authors whenever it 

 has been feasible. 



It remains to express my gratitude to Mr. J. Lewis Ells- 

 worth, secretary of the State Board of Agriculture, and the 

 members of the Board, who have advocated the publication 

 of this work and loyally supported the undertaking. This 

 support has made the publication possible, and to these gen- 

 tlemen is due whatever credit may be given. The responsi- 

 bility for the shortcomings of the work is my own. 



Edward Howe Forbush. 



June 1, 1912. 



