E. E. Sherff, dated 
Paragraph from letter of Dr. 
Jan. 22, 1940. 
A point just comes to mind that may interest you as Senior Curator 
at Gray Herbarium, and that you may cere to note down. I find reason 
to believe that the set of J. F. Rock plants left at G-ray n erbarium 
some twenty years ago was divided with Arnold Arboretum and that Gray 
retained as a rule the better specimens, but that in numerous cases 
Arnold received the specimens with the label that had the collector's 
full field data, accessible nowhere else (unless in his note-book, 
not seen by me, or possibly in some mss. form at G-ray Herbarium). 
Thus, in all critical cases for important, noteworthy specimens, the 
Arnold Arboretum plant should be consulted for supplementary data as 
to height of plant, color of flowers, etc. 
