"I should be glad to receive your delineation of the Mississippi below
Prairie du Chien, and your levels through the Fox and Wisconsin (I
believe in these we agree pretty nearly) would enable me to
consolidate mine.
"While I think of it, let me tell you I have made some calculations
about the height of the Porcupine Mountains. My data are the distance at
which they were seen from Kewewena portage, under the influence of great
refraction, and the distance on the following day without unusual
refraction, and I am convinced they cannot be less than 2000 feet high;
if, however, this staggers you, say 1800, and I am confident you are
_within_ the real elevation.
"Estimates of heights, breadths of rivers, &c., and, in looking over
your journal, any other topographical facts which you may have to
dispose of, will be very acceptable to me. Will you be able to spare me
(that is, to let me copy) any of your drawings? You know, I believe, my
views in asking are to embellish my map and memoir with landscape views
in a light style.
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