The success of the mode of practice I have described was the same as in former years, in private families; but in the city hospital, which was again placed under the care of Dr. Physick and myself, there was a very different issue to it, from causes that are too obvious to be mentioned. There were two opinions given to the public upon the subject of the origin of this fever; the one by the academy of medicine, the other by the college of physicians. The former declared it to be generated in the city, from putrid domestic exhalations, because they saw it only in their vicinity, and discovered no channel by which it could have been derived from a foreign country; the latter asserted it to be "imported, because it had been imported in former years." AN ACCOUNT OF SPORADIC CASES OF _YELLOW FEVER_, AS THEY APPEARED IN PHILADELPHIA, IN 1800. The weather in the month of January was less cold than is common in that month. Catarrhs, the cynanche trachealis, and bilious pleurisies were prevalent in every part of it. A few cases of yellow fever occurred likewise during this month. Several cases of erysipelas appeared in February. The month of March was unusually healthy. The weather was warm in April, and the city as healthy as in March. It was equally so in May and June. The spring fruits appeared early in the latter month, in large quantities, and were of an excellent quality. Locusts were universal in June. They had not appeared since the year 1783. A record from the journal of the Swedish missionaries was published at this time, which described their appearance in 1715, in which year it was said to be very healthy. On the 14th of June there was a severe thunder gust, with more lightning than had been known for seven years before. There fell, during all the months that have been mentioned, frequent and plentiful showers of rain, which rendered the crops of grass luxuriant in the neighbourhood of Philadelphia. The winds at this time were chiefly from the south-east. A few intermittents appeared in June, which yielded readily to the bark. On the 16th day of June, Dr. Physick informed me he had a black boy under his care with the yellow fever. In July, the hooping cough, cholera infantum, and some cases of dysentery and bilious fever appeared in the city. On the 30th of July, Dr. Pascalis informed me that he had lost a patient on the fifth day of a yellow fever. In August, the dysentery was the principal form of disease that prevailed in the city. On the 22d of this month, a woman died of the yellow fever in Gaskill-street, under the care of Dr. Church.