p.2

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but having been advised to write
to you, by a gentleman who
is one of the librarians of the
Astor library, and who said that
when he belonged to the Histor-
ical Society of Chicago that you
sent them a drawing of an
instrument for telling which
way the wind had been blowing;
I thought that perhaps you
might be able to give me some
idea of what I want, and I
earnestly request that if you can
tell me some rules or tell me
what instrument to buy for that
purpose; you will send me word
before New Years day, and that if
I receive any information from you
I shall be most happy to send
you any records on the com-
mencement and end of Storms
or what ever you may desire:

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Now as far as I have read, I can
find no rules except such as this;
that a a high North or North West
wind which ends with a calm is
followed by a South wind which
brings rain, and this if it rises
high, shifts to the West, North West,
and North: if these latter winds
become violent, they sometimes
shift to the North East and blow
for several days together, or else
end in a calm which is followed
by a South wind and so on,
and several others which I have
found generally hold good; but
I have not found any way,
(nor do I know that there is
any,) for telling with certainty
from what direction the wind
will blow on the following day.

I intend to write to
Prof. Henry and ask him if
he can assist me in this subject