Small pocket notebook labelled on cover 'C' and on first page 'P.M.S. Blackett. King's College. Please return if found'. Contains annotated bibliography, arranged by subject: electron impact, disintegration, isotopes, instruments, gases, alpha rays, spectroscope detection of nitrogen, neon, boiling points, electrochemical equivalents, emanating power, radio thorium, among others. Followed by notes on experimental data, May-October (1924) in conjunction with notes in B.5 2pp. of notes for possible papers. N.B. B.4 is not the 'Book A' of this sequence. 1924