List of papers passed for publication in the Proceedings Dorothy C Hodgkin, FRS, Jennifer Kamper, June Lindsey, Maureen Mackay, Jenny Pickworth, R Prosen, J H Robterson, Clara B Shoemaker, K Trueblood and J G White, 'The structure of vitamin B12. I. An outline of the crystallographic investigation of vitamin B12.' A C R Dean, 'The adaptation of bacterial cultures during the lag phase in media containing new substrates or antibacterial agents'. Communicated by Sir Cyril Hinshelwood. A Isaacs and J Lindenmann, 'Virus interference. I. The interferon.' Communicated by C H Andrewes FRS. A Isaacs, J Lindenmann, and R C Valentine, 'Virus interference. II. Some properties of interferon'. Communicated by C H Andrewes FRS. p72. 24 April 1957