
          arrive. I suppose Dr Gray
has told you that several new
genera have turned up among
those I sent him.
I sent Dr Engelmann the 
materials of Cereus giganteus &
he has prepared an article for 
Silliman's journal, describing
also a new Cereus as C. Thurberi.
it grows in Sonora with C. gig. [Cereus giganteus],
about 12 or 15 ft high but very 
different from the latter.

[Drawing of a saguaro]
This is something the shape of the thing.
Could you give away any of the seeds of C. gig?
Dr Gray has sent some 
to Sir Hooker & I should 
be glad to distribute 
the remainder before they get 
too old. I will try to run 
down to Cambridge while you 
are there.

Is there any work on assaying 
that it would be well for me to 
be familiar with?

Very truly & gratefully yours
George Thurber

Dr John Torrey
New York
        