Copy letter from Herbert Rix, to John Newport Langley, Fellow of the Royal Society 'Dear Sir, Your corrections are to hand in time for insertion in the sheet. I regret to say that we cannot send you revise in pages. We have been obliged to discontinue this in consequence of the great delay to publication which it causes. We will use the utmost care in making your corrections. I am, Dear Sir, faithfully yours, Herbert Rix [Assistant Secretary, Royal Society]'. 21 November 1888