Copy letter from Herbert Rix, to Lord Rayleigh [John William Strutt], [Royal Society] 'My Lord, Surgeon Genl [General]? Macdonald has been in inquirig about a paper which he says he gave to your Lordship to read. It was on chromatics. The paper does not seem to have come through to this office. Yours truly, Herbert Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 29 November 1895