p.1

Chicago Nov 19. 1870

Dr Sir

Your letter of 16th is just
received, and I find your corrections
of the barometer appear to be right,
but must hereafter be applied before
you send by telegraph. Send only
the correct figures.

Particular directions will probably
be sent to all the observers from
Washington about the corrections.

Yours truly

IA Lapham
asst. C. S. O.

To Sargent AW Cox
Duluth