Referee's report by Hamilton Hartridge, on a paper 'The nature of normal trichromatic and dichromatic vision' by F H G Pitt Sectional Committee: Physiology Recommended for publication in the 'Proceedings of the Royal Society of London'. Contains extra question - 'Is there any information contained in the paper which likely to be of value to the enemy?' Referee replies no. Encloses letter asks for his regards to be passed to the author. [Published in the 'Proceedings of the Royal Society of London'] Letter endorsed on recto as received 13 April 1943. 12 May 1943