Referee's report by John Charles Grant Ledingham, on a paper 'The photodynamic action of methylene blue on bacteriophage' by J R Perdrau and Charles Todd Sectional Committee: Physiology Not recommended for publication in the 'Proceedings of the Royal Society of London'. The paper is merely a confirmation of the work of Clifton [Robert Bellamy Clifton?], without further advance. [Initially withdrawn, but resubmitted and published in the 'Proceedings of the Royal Society of London' B, 1933] Endorsed on verso as received 20 July 1932. [July 1932]