This is an antograph letter signed "Cha. Lyell", sent by Charles Lyell to an unnamed individual, dated 24 April 1874, 73 Harley Street, London. In this letter he thanks his correspondent for "the additional list of Aldeby shells", explaining that he has completed "[his] new edition of the Students Elements [of Geology]" and that he "[had the assistance of Mr Searles Wood". He goes on to discuss papers and maps relating to the geology of the Rhine which Lyell himself had found instructive, including a paper by Professor Ramsay.