Letter from [John Charles Grant] Ledingham to [Henry] Dale, regarding a paper 'The photodynamic action of methylene blue on bacteriophage' by [Jean René] Perdrau and Charles Todd Paper reference code: B.62 Responding to Todd's criticisms of his original referee report [see RR/W/1/27]. [Initially withdrawn, but later resubmitted, given the new reference B.95 and published in the'Proceedings of the Royal Society of London B, 1933]. Received 27 July 1932. 26 July 1932