Upon entering a sick room where a patient was confined by this fever, the first thing that struck the eye of a physician was the countenance. It was as much unlike that which is exhibited in the common bilious fever, as the face of a wild, is unlike the face of a mild domestic animal. The eyes were sad, watery, and so inflamed, in some cases, as to resemble two balls of fire. Sometimes they had a most brilliant or ferocious appearance. The face was suffused with blood, or of a dusky colour, and the whole countenance was downcast and clouded. After the 10th of September, when a determination of blood to the brain became universal, there was a preternatural dilatation of the pupil. Sighing attended in almost every case. The skin was dry, and frequently of its natural temperature. These were the principal symptoms which discovered themselves to the eye and hand of a physician. The answers to the first questions proposed upon visiting a patient, were calculated to produce a belief in the mind of a physician, that the disease under which the patient laboured was not the prevailing malignant epidemic. I did not for many weeks meet with a dozen patients, who acknowledged that they had any other indisposition than a common cold, or a slight remitting or intermitting fever. I was particularly struck with this self-deception in many persons, who had nursed relations that had died with the yellow fever, and who had been exposed to it in neighbourhoods where it had prevailed for days and even weeks with great mortality. I shall hereafter trace a part of this disposition in the sick to deceive themselves to the influence of certain publications, which appeared soon after the disease became epidemic in the city. In the further history of this fever, I shall describe its symptoms as they appeared, I. In the sanguiferous system. II. In the liver, lungs, and brain. III. In the alimentary canal; in which I include the stomach as well as the bowels. IV. In the secretions and excretions. V. In the nervous system. VI. In the senses and appetites. VII. In the lymphatic and glandular system. VIII. Upon the skin. IX. In the blood. After having finished this detail, I shall mention some general characters of the disease, and afterwards subdivide it into classes, according to its degrees and duration.