
          It will also probably be better to send directly to me
rather than under cover to Mr. Bartlett as I suspect that
is the way I have missed your August letter. Moreover
the Commissioner at the present time may be at San
Diego or some other unknown place by which it would
be a long time before I could get my letters. He has
not been heard from since he left--or rather since 
he was left at Santa Cruz by Col. [Colonel] Graham in September
last. Santa Cruz is a little Mexican town in the
Province of Sonora about 2 days marches from the
Rio San Pedro a confluent of the Rio Gila. Mr.
Wright was with Col [Colonel] Graham at that time and
collected some rare plants. Yours with sentiments
of esteem &c.

John M. Bigelow

P.S. Jan. 17. Since I wrote my letter I have seen Dr. Parry who
was present at the meeting of the American Association for
the Advancement of Science and recollects how Prof [Professor] Agassiz was
elated to find two species added to the small genus of Juglans in
a geological point of view. How much more will he be so to
find that we have in something more than a year doubled
the original number! You appear confident of our Juglans
being a new species! May they not be various forms of J. [Juglans] nigra?
I only hint for information: But the one we find at the Cobre [Santa Rita del Cobre, New Mexico] looks
very much like an intermediate form between the little one and
the Nigra.   
        