Copy letter from Robert William Frederick Harrison, to Ernest G Pope 'Dear Sir, In reply to your letter of April 23rd, the papers by Professor Karl Pearson on Mathematical Contributions to the Theory of Evolution have been published in the "Philosophical Transactions [of the Royal Society]", but the Separate Numbers in which they appeared are out of print. They could be consulted in the volumes of the Transactions where they appeared. I am, faithfully yours, Robt [Robert] Harrison Assistant Secretary R.S. [Royal Society]'. 3 May 1906