But few of the cases of yellow fever which have been mentioned came under my care, but I saw a considerable number of fevers of a less violent grade. They were the inflammatory, bilious, mild remitting, chronic, and intermitting fevers, and the febricula. They appeared, in some instances, distinct from each other, but they generally blended their symptoms in their different stages. The yellow fever often came on in the mild form of an intermittent, and even a febricula, and as often, after a single paroxysm, ended in a mild remittent or chronic fever. When it appeared in the latter form, it was frequently attended with a slow or low pulse, and a vomiting and hiccup, such as attend in the yellow fever. This diversity of symptoms, with which the summer and autumnal fever came on, made it impossible to decide upon its type on the day of its attack. Having been deceived in one instance, I made it a practice afterwards to watch every case I was called to with double vigilance, lest it should contract a malignant form in my hands, without my being prepared to meet it. Of the five original and obvious cases of yellow fever to which I was called, I saved none, for I saw but one of them before the last stage of the disease. In many others, I have reason to believe I prevented that malignant form of fever, by the early and liberal use of depleting medicines. The practice of those physicians who attended most of the persons who had the yellow fever, was much less successful than in our former epidemics. I suspected at the time, and I was convinced afterwards, that it was occasioned by relying exclusively upon bleeding, purges, and mercury. The skin, in several of the cases which I saw, was covered with moisture. This clearly pointed out nature's attempt to relieve herself by sweating. Upon my mentioning this fact to the late Dr. Pfeiffer, jun. he instantly adopted my opinion, and informed me, as a reason for doing so, that he had heard of several whole families in the Northern Liberties, where the disease prevailed most, who, by attacking it in its forming state by profuse sweats, had cured themselves, without the advice of a physician. AN ACCOUNT OF THE _BILIOUS YELLOW FEVER_, AS IT APPEARED IN PHILADELPHIA, IN 1803. The weather in January was uniformly cold. On the 21st of the month, the Delaware was completely frozen. On the 4th of February there was a general thaw, attended with a storm of hail, thunder, and lightning, which lasted about three quarters of an hour. The diseases of both these winter months were catarrhs and bilious pleurisies. The latter appeared in a tertian type. The pain in the side was most sensible every other day.