Referee's report by Ronald Aylmer Fisher, on a paper 'The detection of linkage in human families. I.–Both heterozygous genotypes indeterminate' by Lancelot Thomas Hogben Sectional Committee: Physiology No clear statement regarding publication in the 'Proceedings of the Royal Society of London'. Received the paper from Winckworth. Suggests the paper would be more useful if it discussed actual data in practical terms. Refers to work of Bernstein. [Published in the 'Proceedings of the Royal Society of London' B, 1934] Endorsed on verso as received 13 October 1933. [October 1933]