Copy letter from Robert William Frederick Harrison, to Dr Bennigson, care of Berliner Union Verlagagesellschaft, m.b.H., Berlin, W. 35. 'Dear Sir, Referring to your postcard of February 7, asking for copies of the Philosophical Transactions [of the Royal Society], these can be obtained of Messrs Friedlander & Son, Berlin, from whom all information regarding the same can be had. I am, faithfully yours, Robt [Robert] Harrison Assistant Secretary R.S. [Royal Society]'. 16 February 1906