Contains letters from various figures associated with the society regarding Onslow's work for them: predominantly writing précis of articles in scientific journals such as Nature deemed relevant [see ONSL/3/11], but also providing translations and lists of books which should be reviewed, and writing articles for the Society's journal. Some typed copies of letters from Onslow to the Society also present.
Letters from: Sylvia Gotto, Hon. Secretary; A. M. Carr Saunders, who has 'taken over the bibliography scheme'; R. A. Fisher; Nora Alexander, Assistant Secretary; Leonard Darwin, chairman; Constance M. Brown, Secretary; Miss M. E. Robinson, Literary Assistant'.
A letter from Sybil Gotto as 'Joint Honorary Secretary' of the Professional Classes War Relief Council, 30 Mar 1915, is also included here, thanking Onslow for his 'most generous donation' sent in response to 'the Lord Mayor's invitation'; hopes he will do 'all he can to make [the Society's] work more widely known.