Captain Carleton Haynes (1858–1945), Governor of Brixton Prison in 1918, was a retired army officer and a cousin of BR’s acquaintance, the radical lawyer and author E.S.P. Haynes. In March 1919 BR sent Capt. Haynes, in jest, a copy (now in the Russell Archives) of his newly published Introduction to Mathematical Philosophy — so that the governor’s collection of works written by inmates while under his charge would “not ... be incomplete” (BRACERS 123167).