Letter from H L [Hugh Longbourne] Callendar, 49 Grange Road, Ealing, London, to [Joseph] Larmor Callendar expresses his opinions on physicists with whom he has worked, including [Howard Turner] Barnes, whose work ethic was criticised by Callendar; [Randal Thomas Mowbray Rawdon] Lord Berkeley; and [Alfred William] Porter, whose work Callendar feels was done better by [John Henry] Poynting. Callendar also adds that he is considering contributing to the subject of osmotic pressure himself, as the subject 'seems to be in such a state of chaos'. 19 February 1908