Copy letter from Joseph Larmor to Professor H [Hugh] L [Longbourne] Callendar FRS 'I am sending you a paper by Donnan which will print to 20 pp pf Proc[eedings of the Royal Society]. The illustrations (no sent) are simple. It is very diffuse, but in consideration that we would not have one from him on electric etc. last term, would you agree to stretch a point and take this one, as it stands.' 4 August 1911