
          Cambridge
23 Oct. 1848.

Dear sir
Having just returned
from the mountains, where I have passed
about a month and a half, I have first
of all put in press the fine lichenes which
you so kindly sent me from Capt. Fremont's
collections - and which gained much
in appearance by the recicing effect of the
dampening I gave them - and now writw
with my thoughts on those other precious
collections that you so kindly consented to
entrust to my charge.
I hope the specimen of my way of
studying Potamogeton contained in Silliman's
Journal meets your approbation. I tried hard
        