Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to The Editor, Journal of Physical Chemistry, Ithaca, N.Y. 'Dear Sir, With reference to your postcard of February 23 notifying the loss of "files" of Philisophical Transactions through fire, I am afraid this and the further brief information conveyed is not sufficient to enableus to form any definite conclusion. It would be well to send full particulars. Perhaps you will do this.' 14 March 1916