From the influence of occasional showers of rain, in the months of September and October, the disease was frequently checked, so as to disappear altogether for two or three days in my circle of practice. It was observed, that while showers of rain lessened, moist or damp weather, without rain, increased it. The cold weather in October checked the fever, but it did not banish it from the city. It appeared in November, and in all the succeeding winter and spring months. The weather, during these months, being uncommonly moderate, will account for its not being destroyed at the time in which the disease usually disappeared in former years. The causes which predisposed to this fever were the same as in the year 1793. Persons of full habits, strangers, and negroes, were most subject to it. It may seem strange to those persons who have read that the negroes are seldom affected with this fever in the West-Indies, that they were so much affected by it in Philadelphia. There were two reasons for it. Their manner of living was as plentiful as that of white people in the West-Indies, and they generally resided in alleys and on the skirts of the city, where they were more exposed to noxious exhalation, than in its more open and central parts. The summer fruits, from being eaten before they were ripe, or in too large a quantity, became frequently exciting causes of this fever. It was awakened in one of my patients by a supper of peaches and milk. Cucumbers, in several instances, gave vigour to the miasmata which had been previously received into the system. Terror excited it in two of my patients. In one of them, a young woman, this terror was produced by hearing, while she sat at dinner, that a hearse had passed by her door with a person on it who had died of the yellow fever. Vexation excited it in a foreign master of a vessel, in consequence of a young woman suddenly breaking an engagement to marry him. The disease terminated fatally in this instance. It was sometimes unfortunate for patients when the disease was excited by an article of diet, or by any other cause which acted suddenly upon the system; for it led both them, and in some instances their physicians, to confound those exciting causes with its remote cause, and to view the disease without the least relation to the prevailing epidemic. It was from this mistake that many persons were said to die of intemperance, of eating ice creams, and of trifling colds, who certainly died of the yellow fever. The rum, the ice creams, and the changes in the air, in all these cases, acted like sparks of fire which set in motion the quiescent particles of tinder or gunpowder.