Copy letter from Herbert Rix, to M le Professeur Jean Gaston Darboux, [Foreign Member, Royal Society], Faculte des Sciences, a la Sorbonne, Paris 'Dear Sir, I have received your letter dated March 5th, and cannot understand the non-delivery of our "Transactions" ['Philosophical Transactions of the Royal Society']. They were duly sent through our Agents, Messrs. Dulau & Co., and we have their receipt for the same. I am, however, communicating with Messrs Dulau and will let you hear further. I am, yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 5 March 1894