Thus, therefore, from the charged condition of the cesspool, the defective state of its brickwork and also that of the drain, no doubt remains in my mind that constant percolation for a considerable period had been conveying fluid matter from the drains into the well; but lest any doubt should arise on this subject hereafter, I had two spaces of the brick stemming, 2 feet square each, taken out of the inside of the well, the first 13 feet deep from the level of the street paving, the second 18 feet deep, and a third was afterward opened still lower, when the washed appearance of the ground and gravel fully corroborated the assumption. In addition thereto, the ground was dug out between the cesspool and the well to 3 feet below the bottom of the former, and its black, saturated, swampy condition clearly demonstrated the fact, as did also the small furrowed appearance of the underlying gravel observed from the inside of the well, from which the fine sand had been washed away during the process of filtration. It was thus established as clearly as can be done by circumstantial evidence, that the great epidemic in St. James' Parish, Westminster, London, in 1854, was caused by the polluted water of the Broad Street well, which for a very few days was probably infected with cholera germs. It is much less clear how the well became infected, but it seems probable that the dejecta of a cholera patient found tolerably direct access to the well from the cesspool or drain of a house nearby. There is no evidence whatever that the germs multiplied in the well, but rather much evidence that they rapidly died out. It is repeatedly stated in the report that the water was preferred for drinking because it was cold, _i. e._, colder than the cistern water derived from public water supply and this condition would probably favor such dying out. That the water had long been polluted there can be no doubt. There was evidence of this, and also some evidence that it was worse than usual at the time when it was probably infected. One consumer spoke of it as having been at the time offensive in taste and odor. It is instructive to note that mere pollution seems to have done no obvious harm. Specific infection, however, produced Asiatic cholera.