Copy letter from Robert William Frederick Harrison, to Albert Charles Seward, Fellow of the Royal Society Regrets the 'mischance' regarding figure six in the collotype plate but it is too later to alter now. Queries if one or two references to the matter in the text would meet the difficulty. The colotypers will be told plainly of their blunder. Proof index slips are not sent out except in quite exceptional cases. As to date of publication, Harrison does not think it can be earlier than a month or six weeks. 5 August 1899