TT6 FINAL JOURNEYS AND WORK. [ 1885, 
That is the most probable notion, next to my 
theory. 
For consider, we know the genus only on these two 
opposite shores. 
Perhaps —so far as I know, there is no more C. 
alba in the Old World than C. Conradii in the New. 
And if it were in New England that the former 
occurs, we could say that the Old World received the 
genus from the New — via the Gulf Stream. 
November 6. 
. . . I start farther back than the retreat of the 
glaciers. I suppose that the common ancestor of 
both Coremas was in the high north before the gla- 
cial period, and that the two, in their limited but 
dissociated habitats, are what is left after such vicis- 
situdes ! 
In that view it does not matter how long New Eng- 
land coast was under water. Our plant and its com- 
panions were then further south or west. 
Yours ever, A. Gray. 
On the approach of Dr. Gray’s seventy-fifth birth- 
day it was suggested among the younger botanists that 
some tribute of love and respect should be presented 
tohim. Accordingly a letter was sent to all botanists 
whose addresses could be obtained within the very 
limited time. A silver vase was decided upon, and 
designs furnished, which were most happily and beau- 
tifully carried out. The description, copied from the 
“ Botanical Gazette,” gives its size and decorations. 
“Tt is about eleven inches high exclusive of the 
ebony pedestal, which is surrounded by a hoop of 
hammered silver, bearing the inscription ‘1810, No- 
