At what time is this
work to appear, and what are its plan and objects? My observations and
inquiries respecting the Indians will lead me much further than I
intended or expected. If I can prepare anything upon that subject prior
to the appearance of the work, I shall be happy to do it."
_Geological Survey of Dutchess County_.--Dr. Benjamin Allen, of Hyde
Park, writes to me (June 4th) on this subject, urging me to undertake
the survey; but the necessity of closing my engagements in the West
rendered it impossible.
_Expedition of_ 1820.--Dr. Mitchell furnishes me opinions upon some of
the scientific objects collected by me and my associates in the
north-west in 1820:--
"The Squirrel sent by General Cass is a species not heretofore
described, and has been named by Dr. Mitchell the _federation squirrel_,
or _sciurus tredecem striatus_.
"The Pouched Rat, or _mus bursarius_, has been seen but once in Europe.
This was a specimen sent to the British Museum from Canada, and
described by Dr.
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