Berry’s Letters to Russell [1904–10]

George Godfrey Berry (2 November 1866-31 January 1930) was one of the relatively few people with whom Russell corresponded on mathematical logic before publishing Principia (the others being Couturat, Frege, Jourdain, and Whitehead, and, more briefly, Hardy and Hawtrey). As in the case of Whitehead, we lack Russell’s side of the correspondence. All of those correspondents, except Hardy, were sent a presentation copy of the first volume of Principia (1910).