Referee's report by William Lawrence Bragg, on a paper 'The modes in which valency is exercised. Part I - The tetrahedral carbon atom' by Henry Edward Armstrong and William Barlow Sectional committee: Chemistry Is doubtful whether it is suitable for publication in Proceedings. Despite being ingenious, the whole paper 'is based upon fundamental assumptions which neglect and run counter to recent advances in knowledge', which makes it difficult to recommend for publication. [Not published]. Endorsed on verso as received 5 May 1928. May 1928