JOSEPH TRIMBLE ROTHROCK 209 



" In 1874 I was P ut m charge of a small scien- 

 tific division, and was assigned to duty in New 

 Mexico and Arizona, associated with that dis- 

 tinguished ornithologist, Mr. Henry W. Hen- 

 shaw, now chief of the Division of Economic Zo- 

 ology, in the Department of Agriculture, Wash- 

 ington. 



" The results of our joint labors were, on the 

 whole, somewhat remarkable, and have contrib- 

 uted much to knowledge of the region. I made a 

 dozen sets of plants which averaged probably 

 1,100 species to each set. In 1875 I was assigned 

 in the California division and operated mainly 

 in the central portion of the state. 



" The botanical results of my three years of 

 service on this survey can be found in vol. vi, 

 United States Geographical Surveys West of the 

 100th Meridian, Lieut. G. M. Wheeler, U. S. 

 Engineer, in charge, quarto, pp. 404, thirty illus- 

 trations. The volume enumerates and generally 

 describes 1,168 species, belonging to 637 genera, 

 which in turn represent 104 natural orders of 

 plants. In the preparation of this volume I was 

 assisted by almost every botanical specialist in the 

 country, so that it may fairly be said that the 

 book has been and is still considered a standard 

 one. 



"A considerable portion of the volume is de- 

 voted to topographical considerations and to the 



