Copy letter from Herbert Rix, to Lord Rayleigh, [Royal Society] 'My Lord, You will remember that you took Prof [Professor] Darwin's note with you last Thursday because it contained a question addressed to your Lordship. In a letter received with his corrected proof this morning he requests me to remind your Lordship of this question, to which he desires to have an answer. I am, yours obediently, Herbert Rix'. 29 January 1889