APPEARED IN PHILADELPHIA, IN THE YEAR 1793. Before I proceed to deliver the history of this fever, it will be proper to give a short account of the diseases which preceded it. The state of the weather during the first seven months of the year, and during the time in which the fever prevailed in the city, as recorded by Mr. Rittenhouse, will be inserted immediately after the history of the disease. The _mumps_, which made their appearance in December, 1792, continued to prevail during the month of January, 1793. Besides this disease there were many cases of catarrh in the city, brought on chiefly by the inhabitants exposing themselves for several hours on the damp ground, in viewing the aërial voyage of Mr. Blanchard, on the 9th day of the month. The weather, which had been moderate in December and January, became cold in February. The mumps continued to prevail during this month with symptoms so inflammatory as to require, in some cases, two bleedings. Many people complained this month of pains and swellings in the jaws. A few had the scarlatina anginosa. The mumps, pains in the jaws, and scarlatina continued throughout the month of March. I was called to two cases of pleurisy in this month, which terminated in a temporary mania. One of them was in a woman of ninety years of age, who recovered. The blood drawn in the other case (a gentleman from Maryland) was dissolved. The continuance of a tense pulse induced me, notwithstanding, to repeat the bleeding. The blood was now sizy. A third bleeding was prescribed, and my patient recovered. Several cases of obstinate erysipelas succeeded inoculation in children during this and the next month, one of which proved fatal. Blossoms were universal on the fruit-trees, in the gardens of Philadelphia, on the first day of April. The scarlatina anginosa continued to be the reigning epidemic in this month. There were several warm days in May, but the city was in general healthy. The birds appeared two weeks sooner this spring than usual. The register of the weather shows, that there were many warm days in June. The scarlatina continued to maintain its empire during this month.