Record of experiments 30 Sept. [1931] to 21 June [1932], tabulated results and measurements of crystal analyses. This is the work submitted for Hodgkin's Part II thesis and published in conjunction with H.M. Powell in 1932 (Bibliog. 123). (Ferry pp 72-74; and MS. Eng. c. 5583/14 in the main Hodgkin papers). At rear of book, notes on the literature, latest date 1931. See also MS. Eng. c. 7942/1.