Referee's report by Alan Sterling Parkes, on a paper 'Reversal of the oestrous cycle in animals after transference across the equator, with further observations on the incidence of the breeding seasons and the factors controlling sexual periodicity' by Francis Hugh Adam Marshall Sectional committee: Physiology Recommended for publication in Proceedings, in full. [Published in Proceedings of the Royal Society B, 1937]. [Title changed to 'On the change over in the oestrous cycle in animals after transference across the equator, with further observations on the incidence of the breeding seasons and the factors controlling sexual periodicity'] Endorsed on verso as received 3 May 1937. March 1937