Copy letter from Robert William Frederick Harrison, to Spencer Pickering, Fellow of the Royal Society 'Dear Sir, In reply to yours of the 20th, no, it is not too late to make further corrections in the Warington biography. - We do not actually print off the edition until we have a sufficient number for publication together. I expect we may be publishing the next collection about Christmas. I am, faithfully yours, Robt [Robert] Harrison Assistant Secretary R.S. [Royal Society]'. 22 October 1907