After the first week in September there were no diseases to be seen but yellow fever. In that part of the town which is between Walnut and Vine-streets it was uncommonly healthy. A similar retreat of inferior diseases has been observed to take place during the prevalence of the plague in London, Holland, and Germany, according to the histories of that disease by Sydenham, Diemerbroeck, Sennertus, and Hildanus. It appears, from the register of the weather, that it rained during the greatest part of the day on the 1st of October. The effects of this rain upon the disease shall be mentioned hereafter. On the 10th the weather became cool, and on the nights of the 12th and 13th of the month there was a frost accompanied with ice, which appeared to give a sudden and complete check to the disease.
The reader will probably expect an account of the effects of this distressing epidemic upon the public mind. The terror of the citizens for a while was very great. Rumours of an opposite and contradictory nature of the increase and mortality of the fever were in constant circulation. A stoppage was put to business, and it was computed that about two thirds of the inhabitants left the city.
The legislature of the state early passed a law, granting 10,000 dollars for the relief of the sufferers by the fever. The citizens in and out of town, as also many of the citizens of our sister states, contributed more than that sum for the same charitable purpose. This money was issued by a committee appointed by the governor of the state. An hospital for the reception of the poor was established on the east side of the river Schuylkill, and amply provided with every thing necessary for the accommodation of the sick. Tents were likewise pitched on the east side of Schuylkill, to which all those people were invited who were exposed to the danger of taking the disease, and who had not means to provide a more comfortable retreat for themselves in the country.
I am sorry to add that the moral effects of the fever upon the minds of our citizens were confined chiefly to these acts of benevolence. Many of the publications in the newspapers upon its existence, mode of cure, and origin partook of a virulent spirit, which ill accorded with the distresses of the city. It was a cause of lamentation likewise to many serious people, that the citizens in general were less disposed, than in 1793, to acknowledge the agency of a divine hand in their afflictions. In some a levity of mind appeared upon this solemn occasion. A worthy bookseller gave me a melancholy proof of this assertion, by informing me, that he had never been asked for playing cards so often, in the same time, as he had been during the prevalence of the fever.
Philadelphia was not the only place in the United States which suffered by the yellow fever. It prevailed, at the same time, at Providence, in Rhode-Island, at Norfolk, in Virginia, at Baltimore, and in many of the country towns of New-England, New-Jersey, and Pennsylvania.
The influenza followed the yellow fever, as it did in the year 1793. It made its appearance in the latter end of October, and affected chiefly those citizens who had been out of town.
The predisposing causes of the yellow fever, in the year 1797, were the same as in the year 1793. Strangers were as usual most subject to it. The heat of the body in such persons, in the West-Indies, has been found to be between three and four degrees above that of the temperature of the natives. This fact is taken notice of by Dr. M'Kitterick, and to this he ascribes, in part, the predisposition of new comers to the yellow fever.
In addition to the common exciting causes of this disease formerly enumerated, I have only to add, that it was induced in one of my patients by smoking a segar. He had not been accustomed to the use of tobacco.
I saw no new premonitory symptoms of this fever except a tooth-ach. It occurred in Dr. Physick, Dr. Caldwell, and in my pupil, Mr. Bellenger. In Miss Elliot there was such a soreness in her teeth, that she could hardly close her mouth on the day in which she was attacked by the fever. Neither of these persons had taken mercury to obviate the disease.