Copy letter from Robert William Frederick Harrison, to Professor Herbert Hall Turner, Fellow of the Royal Society 'Dear Professor Turner, Professor Becker's reply to your note on his paper has been received in the form of an Addendum to the paper at present in your hands, and I send it on to you at once for your information. Believe me, very truly yours, Asst. [Assistant] Secretary R.S. [Royal Society]'. 10 April 1907