
          Washington City April 8th 1845

My dear Sir,

I received your letter of the 4th last night.
As we cannot make full use of our
botany for the present report I only
offer slightly to the plants in the 
course of the narrative, rarely mentioning
any other than are very characteristic
but I suppose it will be well to secure
such as the Piñon pine, and the Spirolobium
and I was desirous to have your advice as
to the manner in which I should
mention them. That is to say, I should like
to know the briefest forms, which would
show that you had examined these, &
that they rest upon your authority. Will
the manner [crossed out: is] which you give
"Spirolobium Torr. & Frem." be sufficient?
In the preface I have stated that all the
plants were in your hands and that whatever
was said in regard to botany rested on your
authority- but that there had not been
sufficient time for you to prepare a full
        