From the history which has been given of the symptoms of this fever; from the less force of medicine that was necessary to subdue it; from the safety and advantage of blisters in its _early_ stage; and from the small proportion which the deaths bore to the number of those who were affected, being seldom more than five in a hundred (including all the grades and forms of the disease), in the practice of most of the physicians, it is evident this fever was of a less malignant nature than it had been in most of the years in which it had been epidemic. There was one more circumstance which proved its diminution of violence, and that was, a more feeble operation of its remote cause. In the year 1802, nearly all the persons who were affected with the fever in the neighbourhood of Vine and Water-streets, and in Water, between Walnut and Spruce-streets, died. This year, but two died of a great number who were sick in the former, and not one out of twelve who were sick in the latter place. The filth, in both parts of the city, was the same in both years. This difference in the violence and mortality of the fever was probably occasioned by a less concentrated state of the miasmata which produced it, or by the co-operation of a less inflammatory constitution of the atmosphere. The yellow fever was epidemic, during the summer and autumn of this year, in New-York, and in Alexandria, in Virginia. In the latter place, Dr. Dick has informed the public, it was derived from domestic putrefaction. AN ACCOUNT OF SPORADIC CASES OF _YELLOW FEVER_, AS THEY APPEARED IN PHILADELPHIA, IN 1804. The month of January was marked by deep snows, rain, clear and cold weather, and by the general healthiness of the city. In February there fell a deep snow, which was followed by several very cold days. There was likewise a fall of snow in March, which was succeeded by an uncommon degree of cold. Catarrhs and bilious pleurisies were very common during both these months. In the beginning of April, the weather was cold and rainy. There were but few signs of vegetation before the 15th of the month. Bilious pleurisies were still the principal diseases which prevailed in the city. The month of May was wet, cool, and healthy. In June, the winds were easterly, and the weather rainy. The crops of grass were luxuriant. It was remarked, that the milk of cows that fed upon this grass yielded less butter than usual, and that horses that fed upon it, sweated profusely with but little exercise. On the third of the month, I was called upon by Dr. Physick to visit his father, who was ill with a bilious fever. He died on the seventh, with a red eye, hiccup, and black vomiting.