Folder B.34.1: 'Helium', 1941. 5 sets of MS. notes and calculations, separately paginated, and numbered 1-5, and miscellaneous untitled loose pages of notes. Folder B.34.2: 'Electrolytes', c.1941. Work in collaboration with G.S. Rushbrooke; miscellaneous MS. notes, and 3 sets of drafts by collaborator. Folder B.34.3: 'Electron velocities in molecular hydrogen H2', n.d. 14 pp. typescript 'Origin of the problem', addressed to (unnamed) collaborator,...