Copy letter from Robert William Frederick Harrison, to J A Tomkins, 19 Howard Street, Bradford 'Dear Sir, With reference to the enquiry in your letter of December 6th., at the time you wrote, Proceedings [of the Royal Society] No. A 534 was the last issued. Since then, No. 535 has appeared, and is, no doubt, in your hands by now. I am, faithfully yours, Robt [Robert] Harrison Assistant Secretary R.S. [Royal Society]'. 10 December 1907