Referee's report by Archibald Vivian Hill, on a paper 'The extent of air in the tracheoles of some terrestrial insects' by Vincent Brian Wigglesworth Sectional committee: Zoology Not recommended for publication in Proceedings, until it has been made clearer. The discussion should be omitted as it adds little and is unintelligible in places. Some modifications are required. He wishes James Gray to review the paper as he knows more about the anatomy of these organs. [Published in Proceedings of the Royal Society B, 1931]. Endorsed on verso as received 8 October 1931. October 1931