6 PREFACE. 



Acknowledgments are tendered to Mr. J. S. Cotton, of the Wash- 

 ington State Experiment Station, who accompanied Dr. Griffiths in 

 his travels over the ranges in that State, and to Prof. Byron Hunter, 

 of the Idaho State Normal School, who rendered similar service in 



Oregon and Nevada. 



W. J. Spillman, 



Agrostologisi. 



Office of the Agrostologist, 



Washington, I). 6'., March 8, 1903. 



