Referee's report by Francis Hugh Adam Marshall, on a paper 'Effect of absence of light on the breeding season of the ferret' by Margaret Hill and Alan Sterling Parkes Sectional Committee: Physiology Recommended for publication in the 'Proceedings of the Royal Society of London'. The author should be aware that in the view of Francis Hugh Adam Marshall, light is only one factor acting on reproduction. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 26 January 1934. [January 1934]