Referee's report by William Lawrence Bragg, on a paper 'The modes in which valency is exercised. Part II - The tetrahedral carbon atom' by Henry Edward Armstrong Sectional committee: Chemistry Not recommended for publication in Proceedings. The criticisms he made about the accompanying paper by Armstrong and Barlow also apply to this paper (RR/37/4). [Not published]. Endorsed on verso as received 5 May 1928. May 1928