UNIVERSITY OF CALIFORNIA 
DEPARTMENT OF BOTANY 
BERKELEY, CALIFORNIA 
April 29, 1940 
Smithsonian Institution 
United States National Museum 
Washington, D. 0. 
Dear Mr* Walker: 
I am very glad to have the additional determina¬ 
tions on the Rook Collection* These determinations 
have been recorded and, as you suggested, the original 
list is being returned to you* 
Sincerely, 
Herbert L. Mason 
Curator of the Herbarium 
ENGL 
