Letter from William Augustus Tilden, on a paper 'Constitution of the terpenes camphors and camphor acid' by John Norman Collie to John William Strutt, Lord Rayleigh, Secretary of the Royal Society The paper's fundamental assumptions are 'so speculative'. However, it is also 'worthy of attention'. Referee is unsure as to whether the paper should be published in Philosophical Transactions. Asks the Secretary to decide, as he can 'decide better'. Subject: Chemistry [Not published]. 19 November 1891