First. My Gray’s Inn friend, on a time, hurt one of his legs, and it became seriously inflamed. Not knowing of his indisposition, I was on my way to visit him as usual, one summer evening, when I was much surprised by meeting a lively leech in Field-court, Gray’s Inn, seemingly on his way to the West End of London. As the leech was alone, and was of course unable to explain his position, even if he had been inclined to do so (which he had not the appearance of being), I passed him and went on. Turning the corner of Gray’s Inn-square, I was beyond expression amazed by meeting another leech—also entirely alone, and also proceeding in a westerly direction, though with less decision of purpose. Ruminating on this extraordinary circumstance, and endeavouring to remember whether I had ever read, in the Philosophical Transactions or any work on Natural History, of a migration of Leeches, I ascended to the top set, past the dreary series of closed outer doors of offices and an empty set or two, which intervened between that lofty region and the surface. Entering my friend’s rooms, I found him stretched upon his back, like Prometheus Bound, with a perfectly demented ticket-porter in attendance on him instead of the Vulture: which helpless individual, who was feeble and frightened, and had (my friend explained to me, in great choler) been endeavouring for some hours to apply leeches to his leg, and as yet had only got on two out of twenty. To this Unfortunate’s distraction between a damp cloth on which he had placed the leeches to freshen them, and the wrathful adjurations of my friend to ‘Stick ’em on, sir!’ I referred the phenomenon I had encountered: the rather as two fine specimens were at that moment going out at the door, while a general insurrection of the rest was in progress on the table. After a while our united efforts prevailed, and, when the leeches came off and had recovered their spirits, we carefully tied them up in a decanter. But I never heard more of them than that they were all gone next morning, and that the Out-of-door young man of Bickle, Bush and Bodger, on the ground floor, had been bitten and blooded by some creature not identified. They never ‘took’ on Mrs. Miggot, the laundress; but, I have always preserved fresh, the belief that she unconsciously carried several about her, until they gradually found openings in life.