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Thanks for JG's Correlation of Physical Forces; JH is still uncertain about the nature of heat.
Sorry that JH can only send 'very poor' photographic process specimens.
Offers assistance as needed.
Asks to be allowed to join the new Philosophical Club on a trial basis [see letter of same date to John P. Gassiot].
Thanks for and comments on new edition of WG's Correlation of Physical Forces, particularly the subject of transformation of heat into motion.
Asks time and place of next meeting of Philosophical Club, having received invitation lacking that information.
Encloses post office order; not knowing WG's 'Christian' name; hopes that WG can sign 'William.' Apologizes for being unable to attend 'the Dinners.'