Within the building and grounds the most diligent search failed to discover anything that could account for this outbreak; but on examining the premises outside the northern wall, there was found a vast mass of filth, consisting of the overflowings of cesspools, the drainage from pigsties, and the general refuse of the establishment. “In short,” says the medical officer, “the whole space included between the ravine and the wall, upon its north side, was one putrid and pestilential mass, capable of generating, under the ardent rays of a Midsummer sun, the most poisonous and deadly exhalations.” During the greater part of the time that this outbreak continued, a slight breeze set in pretty steadily from the north, conveying the poisonous exhalations from behind the north wall directly over the house. The first persons attacked were those who happened to be particularly exposed to the air blowing from the north side of the building. On the male side of the house there was no protection from the ravine. The female side was partially protected by three rows of trees. The residents on the women’s side were more numerous than on the men’s, but the attacks were considerably less. Among the paupers, those who slept in apartments exposed to the north were attacked, those not so exposed generally escaped. In the basement story of a building, opening directly to the north, and close to a spot which received the contents of one of the cesspools, 17 lunatics were lodged, all of whom were attacked, and all died. Eight medical students were attached to the establishment, of whom four occupied apartments with a northern exposure, and four were lodged in rooms with a southern exposure. The four whose rooms were exposed to the north were attacked, the four whose rooms were not thus exposed escaped. The manager, also, who slept in a room above that of the students looking to the north, was attacked: his family, whose rooms looked to the south, escaped. Men, after some difficulty and delay, were employed to remove the filth and drain the ravine, the whole surface of which, after having been thoroughly cleansed by a stream of water, was thickly covered with lime, over which was put a deep stratum of earth. The men employed in this work were attacked with cholera, as were some of the several inmates of the almshouse who had been dispersed throughout Baltimore, but the disease did not spread to any other persons in the city. From the 25th of July, the day on which the drainage was completed, the disease suddenly declined from 11 the day previous, to 3, and, by the 9th of August, had entirely disappeared. * * * * *