Letter from William Crookes, 7 Kensington Park Gardens, London, to [Joseph] Larmor Noting that he has enclosed a copy of [Henry Augustus] Rowland's iron spectrum, which is not published but was sent to Crookes as a favour before Rowland's death. Crookes seeks references to other 'spectra of iron', and notes that the ones he has obtained 'must be old, as they are much inferior to mine'. He notes that he does not consider his own worth presenting to the Royal Society, but that the 'chief value of my collection is its completeness'. 15 February 1905