CD’s Classed account book (Down House MS) for 1864 included payments to Blunts, or Blunt and Salter, a Shrewsbury dispensing chemist. Blunts was ‘believed at Down to be the best chemist in the world’ (Emma Darwin (1915) 2: 118 n. 2; see also Correspondence vol. 2, letter to Catherine Darwin, [16 September 1842]).