The ideas of my friend Watson, though limited, are exceedingly pertinacious. For a long time he has worried me to write an experience of my own. Perhaps I have rather invited this persecution, since I have often had occasion to point out to him how superficial are his own accounts and to accuse him of pandering to popular taste instead of confining himself rigidly to facts and figures. “Try it yourself, Holmes!” he has retorted, and I am compelled to admit that, having taken my pen in my hand, I do begin to realize that the matter must be presented in such a way as may interest the reader. The following case can hardly fail to do so, as it is among the strangest happenings in my collection though it chanced that Watson had no note of it in his collection. Speaking of my old friend and biographer, I would take this opportunity to remark that if I burden myself with a companion in my various little inquiries it is not done out of sentiment or caprice, but it is that Watson has some remarkable characteristics of his own to which in his modesty he has given small attention amid his exaggerated estimates of my own performances. A confederate who foresees your conclusions and course of action is always dangerous, but one to whom each development comes as a perpetual surprise, and to whom the future is always a closed book, is indeed an ideal helpmate.