Copy letter from Robert William Frederick Harrison, to Messrs Dulau & Company, 37 Soho Square, W. 'Referring to your a/c/ sales furnished during the present year there are a few items which apparently are not in your statements. I send you six of your order slips to help you to trave them, but please take care to return them. The matter can be put right in a future a/c. I am, yours faithfully, Robt Harrison Assist. Sec. R. S. [Assistant Secretary, Royal Society]'. 23 October 1896