You have so often reminded me how rapidly the most startling facts pass from the memory of man, and I have so often thereupon promised to write down a full account of that mysterious affair in which I was providentially called upon to play so prominent a part, that it is with shame I reflect that the warning has been unheeded and the promise unfulfilled. Do not, dear friend, accuse my affection, but my engrossing duties and occupations, for this neglect, and believe that I now take advantage of my first quiet evening for many months to fulfil your wish.