was accordingly cut; what little water remained was conveyed off, and the whole surface covered with fresh earth. The effects of this scheme were soon obvious. Not a man was seized with the worst form of the fever after the work was finished, and the sick were not a little benefitted, for they generally recovered, though slowly, because the fever became a common remittent, or gradually assumed the intermitting form. A few cases of remitting and intermitting fever occurred occasionally, till frost put an end to it in every form. As soon as the contents of the pond were changed, by cutting the ditch, the cause, whatever it was, seems to have been rendered incapable of communicating the disease in its worst form.” Dr. Potter further states that, on one occasion, he saw a lady, who had been confined three days only, and whom he found in the agonies of death, with the skin of a deep orange colour, the eyes red and prominent, the pulse intermittent, and ejecting copiously from the stomach every eight or ten minutes, the secretion now known by the name of the black vomit; that she expired in a convulsion, while he sat at her side; that petechiæ appeared immediately after death, and that putrefaction succeeded so rapidly, that it was necessary to order immediate interment: that, shortly afterwards, he was called to a gentleman who had been ill five days, and who, having expired in an hour or two after his visit, was removed into the coffin with the utmost difficulty, the flesh literally dropping from the bones: that, in one family residing in a house which stood on a level piece of ground, apparently beyond the reach of noxious exhalation, there being no stagnant water, as was supposed, within a mile of it, he found the mother labouring under a bilious remitting fever, which had continued eleven days; the daughter, seventeen years of age, suffering from a similar fever; two sons, the one between eight and nine, and the other six, ill with dysentery; and the father, on the brink of the grave, from a most malignant fever. There being no apparent cause for the condition of this afflicted family, the immediate neighbourhood of the house being free from the ordinary sources of malaria, and the adjacent country being not unhealthy, the condition of the house itself was minutely investigated. The cause of the evil was manifest. It appeared that the present family had resided in the house only about five weeks; that immediately preceding their occupation of it, a man had died suddenly in it; that he himself (Dr. Potter) was seized with nausea and general lassitude, immediately on leaving the house after his first visit; and that a fever, as he supposes, was arrested by a strong dose of tartarized antimony, which operated violently by vomiting and purging. On examining the premises, it was found that the cellar contained water about two feet deep, which had remained there from the first week in June, the country having been then inundated by torrents of rain.