Copy letter from Robert William Frederick Harrison, to Harold E Gorat, Potentia Organization, Clun House, Surrey Street, Strand 'Dear Sir, In reply to your letter of yesterday, before proceeding further with the subject of your letter, I should be much obliged by your forwarding me some particulars, if you have any in documentary form, with regard to the Potentia Organization, as to which I am at present entirely ignorant. I am, Dear Sir, faithfully yours, Robt [Robert] Harrison Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 16 January 1906