Referee's report by Reginald Crundall Punnett, on a paper 'The genetical activity of heterochromatin' by Kenneth Mather Sectional Committee: Zoology Recommended for publication in the 'Proceedings of the Royal Society of London'. Cannot comment on the statistical method, can only assume its validity. The experimental method is ingenious. Contains extra question - 'Is there any information contained in the paper which likely to be of value to the enemy?' Referee replies no. [Published in the 'Proceedings of the Royal Society of London'] No received date. 7 November 1943