Dear Sir/
I recd your letter 1 from Worthing for which let me thank you and for the remarkably elegant formula for the latus Rectum of a Conic Section. I also found on my return to Town your paper on Cold flames which I shall as you desire immediately forward to Dr Brewster. 2
I was not aware you were about to quit England so speedily. 3 My only acquaintance at Geneva now & Maret & Pictet 4 are no more, is Professor Gautier, 5 to whom I annex a letter. I
I wish you a pleasant journey and if I could slip myself into your portmanteau I should be very glad.
Yours truly
JFW Herschel
P.S. I am not sure whether an acquaintce of mine M. Soret 6 is at Geneva still if so I have requested Mr Gautier to introduce you to him, as he is very conversant in Physical optics and has written some good papers on the action of Crystals on light. 7 Also he may be of use to you in other ways as he was to me by giving me free access to their “Athenæum” &c &c
Devonshire St
Wednesday evening
PPS. Will you do me the favor also to deliver to Mr Gautier the annexed Vol of the Trans. Astr. Soc. for the Helvetic Society 8
H. F. Talbot Esqr
Albany
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