Referee's report by Thomas Smith, on a paper 'On particle size and concentration in opal glasses I' by C Dunbar Sectional Committee: Physics Not recommended for publication in the 'Proceedings of the Royal Society of London'. The paper should not have been split into two parts. They add little to the work already published by Ryde and Cooper. [Not Published] Endorsed on verso as received 15 June 1933. [June 1933]