The contents are as follows: (i) Typescript, partly in carbon, of a proposed popular book on science entitled 'Life' written apparently between 1933 and 1937 (folio 1); (ii) Typescript, partly in carbon, of a proposed book on zoology based upon lectures given by J B S Haldane, including some material from lectures given by his wife Helen at University College, London, apparently about 1953 (folio 68); (iii) Copy in typescript carbon of the preface to ‘Outline of human genetics…’ by L S Penrose, with related letters between them (folio 185); (iv) Manuscript of preface, dated May 1964, of a projected reprint of Haldane's ‘Enzymes’ (folio 192).