14 n. h. experiment station [Bulletin 156 



Bulletin No. S.l, Canadian Department of Agriculture, Ot- 

 tawa, Can. 



Bulletin No. 152, Maine Experiment Station, Orono, Me. 



Bulletin No. 146, Vermont Experiment Station, Burlington, Vt. 



Bulletin No. 260, Michigan Experiment Station, East Lansing, 

 Mich. 



Circular No. 4, Wisconsin Experiment Station, Madison, Wis. 



Bulletin No. 127, Kentucky Experiment Station, Lexington, 



Ky. 



Bulletin No. 115, Iowa Experiment Station, Ames, Iowa. 



Bulletin No. 110, Nebraska Experiment Station, Lincoln, Neb- 

 Seed Bulletin No. 1, No. Dakota Experiment Station, Fargo, 

 N. D. 



