Letter from Henry Cohen, Los Angeles, California, to [Robert William Frederick] Harrison, Assistant Secretary of the Royal Society, Burlington House, London, England 'Dear Sir: I am very much obliged to you for your information concerning the publication of the obiturary of Prof. J J Sylvester. I have sent to my London book buyer for the work. I have a copy of the Jewish Encyclopaedia, and had already referred to the matter therein. Sylvester was well known on this side of the Atlantic. Thanking you again, I am, Yours very truly, Henry Cohen'. 1 August 1907