| Description | 64a) 1 Mar. 1780. 2pp.
64b) 9 Mar. 1780. 2pp.
62c) 20 Mar. 1780. 2pp. Upon Dr Black's claims to the Discovery of the Doctrine of Latent Heat. Partners nos. 59, 61, 64). Separate folded paper wrapper has been docketted by James Watt jr. with names of correspondents, date(s) of letter(s) and a summary of the contents. |