In a letter to Herbert, 21 November 1872 (APS 425), CD says, ‘Do you remember giving me anonymously a microscope? I can hardly call to mind any event in my life which surprised & gratified me more.’

See letter to W. D. Fox, [11 May 1831], the source of the approximate date of this letter.

Of three microscopes on display at Down House, one bearing the maker’s name of ‘Cary’ corresponds in structure to that described by Henry Coddington in a paper read in 1830 to the Cambridge Philosophical Society (Coddington 1830). Professor Phillip Sloan of the University of Notre Dame, who has examined the instrument in connection with his study of CD’s microscopy, has concluded that it is the one referred to in this letter. Herbert may have given Coddington’s name to the instrument because it had been built by George and John Cary, London instrument makers, according to Coddington’s specifications; it used an improved lens, which though not invented by Coddington was commonly called after him.