
          again and wake up his memory for more data. I dont know
whether that would be of much use.

Fremont was here last week, and went west. I have
written for him for a full instruction about many things
especially Cactaceae, what to examine and inquire into,
how to figure and collect. If you think it would be
useful I can send a copy to Emory and Halstead.
Gregg's Cactaceae - [at least?] my specimens are difficult to name
or describe as he collects the flowers only and that very poorly.
As you know many Cactaceae are only known without flower
and almost all can be distinguished without  it; but the
reverse is not the case _ at least has never been attempted.
I shall be glad however to see and examine your
specimens, and name them if I can.

Speaking of Euphorbiae could I see your Euphorbiae?
at least the stipulatae? Is not what you supposed to be 
E. portulacoides the same plant which I named E. geyeri
in Plant [Lindh?] - common in all collections from the upper Arkansas,
Santa Fe etc, distinguished by the large petaloid [appendices?]?
But what then is Pursh's plant of that name from Pennsylvania
"[?] folia aequantibus"?  among  Fendlers plants are
specimens of the [?] E. hexagona Nutt

I can find no specimens of the Amoreuxia among my
set of Gregg's plants. But in looking over Greggs & Wislizenus
plants to find it, I hit upon two plants, which I had put
aside, not knowing at the moment where to place them, and
found them to be two smooth & glaucous species of Satropha
as now defined; the one from El Paso, the other from the lower
Rio Grande, both apparently undescribed.

If you send me any Pines, dont forget to send the cones
along. Please to let Dr Gray know that you are sending
me a package, he will add several things.

As regards Pines or Conifers in general I repeat that
I shall with pleasure undertake any part you would assign
to me; but  I have never studied them yet! Never
examined a Pine I believe, before the new species of 
Wislizenus forced me to do it.  The second consideration
is my time! If it must be done soon I can
not undertake it as all my leisure time will be already
occupied for some time to come.  You must do as
        