Copy letter from Robert William Frederick Harrison to The Secretary, American Mathematical Society, 501 West 116th Street, New York 'Dear Sir, With reference to your letter of March 24, notifying the non-receipt of Proceedings [of the Royal Society] No. 636, and separate papers Phil[osophical] Trans[actions], Nos 422, 423, 424, our printers inform us that they have looking into the matter, and that the copies were duly despatched. I shall be glad therefore if you will make further search for the missing parts. The Transactions papers came out in January last, and all were issued in the same week. In such case the printers send the numbers in one packet.' 9 April 1908