He was walking by the sea-shore at Harwich, with this sling in his pocket; before his paces had covered a mile he was attacked by a fierce animal called a seahorse, open-mouthed, who ran at him with great fury; he hesitated a moment, then took out his sling, retreated back about a hundred yards, stooped for a couple of pebbles, of which there were plenty under his feet, and slung them both so dexterously at the animal, that each stone put out an eye, and lodged in the cavities which their removal had occasioned. He now got upon his back, and drove him into the sea; for the moment he lost his sight he lost also ferocity, and became as tame as possible: the sling was placed as a bridle in his mouth; he was guided with the greatest facility across the ocean, and in less than three hours they both arrived on the opposite shore, which is about thirty leagues. The master of the _Three Cups_, at Helvoetsluys, in Holland, purchased this marine horse, to make an exhibition of, for seven hundred ducats, which was upwards of three hundred pounds, and the next day my father paid his passage back in the packet to Harwich. _--My father made several curious observations in this passage, which I will relate hereafter._ CHAPTER XII _The frolic; its consequences--Windsor Castle--St. Paul's--College of Physicians--Undertakers, sextons, &c., almost ruined--Industry of the apothecaries._ THE FROLIC. This famous sling makes the possessor equal to any task he is desirous of performing. I made a balloon of such extensive dimensions, that an account of the silk it contained would exceed all credibility; every mercer's shop and weaver's stock in London, Westminster, and Spitalfields contributed to it: with this balloon and my sling I played many tricks, such as taking one house from its station, and placing another in its stead, without disturbing the inhabitants, who were generally asleep, or too much employed to observe the peregrinations of their habitations. When the sentinel at Windsor Castle heard St. Paul's clock strike thirteen, it was through my dexterity; I brought the buildings nearly together that night, by placing the castle in St. George's Fields, and carried it back again before daylight, without waking any of the inhabitants; notwithstanding these exploits, I should have kept my balloon, and its properties a secret, if Montgolfier had not made the art of flying so public.