Copy letter from Robert William Frederick Harrison to W R Twigg, Woolverston, Westbourne Road, Luton 'Referring to your letter of February 10th, you should apply to Messrs Dulau & Co., 37 Soho Square, London, W, giving reference "[Philosophical] Trans[actions of the Royal Society], A, No.328", for Professor Dixon's paper. They will doubtless be able to supply a separate copy.' 14 February 1912