Copy letter from Herbert Rix, to Herrn Professor Dr Kraepelin, Naturhistorische Museum, Hamburg 'Dear Sir, We had overlooked the fact, until receipt of your letter, that the name of the Naturhistorische Museum was not on our exchange list. I will ascertain the wish of the Committee in the matter, and will communicate with you again. Thanking you for your very valuable and well illustrated publication, I remain, Dear Sir, faithfully yours Herbert Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 28 November 1889