Though carefully educated in medicine and surgery, I have never practised either. The study of each continues, nevertheless, to interest me profoundly. Neither idleness nor caprice caused my secession from the honourable calling which I had just entered. The cause was a very trifling scratch inflicted by a dissecting knife. This trifle cost me the loss of two fingers, amputated promptly, and the more painful loss of my health, for I have never been quite well since, and have seldom been twelve months together in the same place. In my wanderings I became acquainted with Dr. Martin Hesselius, a wanderer like myself, like me a physician, and like me an enthusiast in his profession. Unlike me in this, that his wanderings were voluntary, and he a man, if not of fortune, as we estimate fortune in England, at least in what our forefathers used to term "easy circumstances." He was an old man when I first saw him; nearly five-and-thirty years my senior...