In publishing these short sketches, based upon the numerous cases in which my companion's singular gifts have made me the listener to, and eventually the actor in some strange drama, it is only natural that I should dwell rather upon his successes than upon his failures. And this is not so much for the sake of his reputation, for indeed it was when he was at his wits’ end that his energy and his versatility were most admirable, but because where he failed it happened too often that no one else succeeded, and that the tale was left for ever without a conclusion. Now and again, however, it chanced that even when he erred the truth was still discovered. I have notes of some half-dozen cases of the kind, of which the affair of the second stain and that which I am now about to recount are the two which present the strongest features of interest.

Sherlock Holmes was a man who seldom took exercise for exercise's sake. Few men were capable of greater muscular effort, and he was undoubtedly one of the finest boxers of his weight that I have ever seen; but he looked upon aimless bodily exertion as a waste of energy, and he seldom bestirred himself save where there was some professional object to be served. Then he was absolutely untiring and indefatigable. That he should have kept himself in training under such circumstances is remarkable, but his diet was usually of the sparest, and his habits were simple to the verge of austerity. Save for the occasional use of cocaine he had no vices, and he only turned to the drug as a protest against the monotony of existence when cases were scanty and the papers uninteresting.

One day in early spring he had so far relaxed as to go for a walk with me in the Park, where the first faint shoots of green were breaking out upon the elms, and the sticky spearheads of the chestnuts were just beginning to burst into their five-fold leaves. For two hours we rambled about together, in silence for the most part, as befits two men who know each other intimately. It was nearly five before we were back in Baker Street once more.