Referee's report by Archibald Vivian Hill, on a paper 'A theory of tracheal respiration in insects' by Vincent Brian Wigglesworth Sectional committee: Physiology Recommended for publication in Proceedings, in full. The author should be asked to consider the possibility of 'surface tension exerting a considerable influence on the phenomenon'. [Published in Proceedings of the Royal Society B, 1930]. Endorsed on verso as received 22 February 1930. February 1930