Referee's report by David Keilin, on a paper 'On the cytological action of methylene blue' by Reginald James Ludford Sectional Committee: Physiology Not recommended for publication in the 'Proceedings of the Royal Society of London'. The observations are not necessarily new or interesting, and could be covered by a few printed pages. The experiments described have little relation to the initial observation, with the relevant experiments barely begun. [Not published] Endorsed on verso as received 4 January 1935. [January 1935]