Copy letter from Herbert Rix, to Messrs W F Dennis & Company, 11 Billiter Street, E.C. In answer to the Messrs letter of yesterday addressed to Dr [Michael] Foster, the paper in question by Messrs Swan and Rhodin was published in the 'Proceedings of the Royal Society', number 336, which can be obtained from Messrs Harrison & Sons, 45 St Martin's Lane, price four shillings and six pence. 5 October 1894