The weather was very cold, and bilious pleurisies were common, during the latter part of the month of February.
March was equally cold. The newspapers contained accounts of the winter having been uncommonly severe in Canada, and in several European countries.
The first two weeks in April were still cold. The Delaware, which had been frozen a second time during the winter, was crossed near its origin, on the ice, on the 15th day of this month. The diseases, though fewer than in the winter, were bilious and inflammatory. During this month, I was called to a case of yellow fever, which yielded to copious bleeding, and other depleting medicines.
May was colder than is usual in that month, but very healthy.
In the first week of June, several cases of highly bilious fever came under my care. In one of them, all the usual symptoms of the highest grade of that fever occurred. On the 13th of the month, Dr. Physick informed me, that he had lost a patient with that disease. On the 23d of the same month, Joseph Ashmead, a young merchant, died of it. Several other cases of the disease occurred between the 20th and 29th days of the month, in different parts of the city. About this time, I was informed that the inhabitants of Keys's-alley had predicted a return of the yellow fever, from the trees before their doors emitting a smell, exactly the same which they perceived just before the breaking out of that disease in 1793.
In July, the city was alarmed, by Dr. Griffitts, with an account of several cases of the fever in Penn-street, near the water. The strictness with which the quarantine law had been executed, for a while rendered this account incredible with many people, and exposed the doctor to a good deal of obloquy. At length a vessel was discovered, that had arrived from one of the West-India islands on the 14th of May, and one day before the quarantine law was put into operation, from which the disease was said to be derived. Upon investigating the state of this vessel, it appeared that she had arrived with a healthy crew, and that no person had been sick on board of her during her voyage.
In the latter part of July and in the beginning of August, the disease gradually disappeared from every part of the city. This circumstance deserves attention, as it shows the disease did not spread by contagion.