UNITED STATES DEPARTMENT OF AGRICULTURE 
BUREAU OF PLANT INDUSTRY 
FOREST PATHOLOGY 
Dear Dr. Robinson: 
13 Brown Street, 
Providence, R.I. 
March 25, 1926 
I have just learned that among the effects of the late 
Prof. Ellsworth Bethel, of the Museum of natural History, Denver, Golo. 
is a portfolio of some 65 sheets of plants of the Hayden Survey of U.S. 
Territories, 1877; marked "Soil. J. P. Hooker & A. Gray" and in a hand- 
not 
writing, presumably/of Asa Gray "Arranged by Prof. Asa Gray and presented 
by him to Tilley E. Stevenson, Washington, D. C." I understand Stevenson 
is supposed to have been one of Hayden's assistants. The labefill are 
l u 
written in what is presumed to be Asa Gray's handwriting. 
1 have been asked if this is likely to be of any particular value and 
I am unable to say. Gan grou enlighten me on this point? I suppose that 
its possible value will depend largely upon whether this is merely a 
soubenir collection separated from a large collection of plants made on 
the survey or is one of a few sets of plants collected on the expedition. 
Mrs. Bethel is endeavoring to realize as much as possible on the things 
left by her husband. 
Sincerftly 
J. Eranklin Collins 
