These are the chief characteristic symptoms of this fever. I shall next point out such modifications of it as occurred in the West Indies from the influence of climate. In the first place, when this fever prevailed on board of any ship that arrived from a northern climate, it was soon after succeeded by, or, as it were, converted into, a dysentery; for those ships that arrived either from England or North America with the greatest stock of feverish infection, were the most subject to fluxes, after being two or three months in the West Indies. This was formerly made use of as an argument, to prove that the dysentery proceeds from the same cause with fever, taking a different determination, from circumstances of climate and constitution. Secondly, It sometimes happens that men, under the influence of this infection, are more apt than others to be affected with symptoms peculiar to the climate upon their first arrival. A very striking instance of this has been mentioned in the case of men that were pressed into the Formidable at New York, some of whom had the common ship fever on the passage; others, upon our arrival at Barbadoes, were seized with the yellow fever, and were the only men in the fleet who had it at that time. There was another instance in the recruits brought from England by the Anson, who were seized with a fever on board of the Royal Oak; and in this fever the skin and eyes were yellow, though without any symptoms of malignancy[90]. Thirdly, It happened in some ships[91] that the infection was kept up for several months after arriving in the climate, from a neglect of cleanliness, or the want of an opportunity of removing those who were infected to an hospital. It did not in these take a dysenteric turn, as in most of the other ships, but differed from the ship fever of colder climates, as above described, in some particulars, which I shall here enumerate. All the symptoms were milder: it was more protracted, and less dangerous. In the beginning there was but little difference, only the symptoms were less violent; but in the succeeding period of the disease the pulse deviated very little from the natural standard, and the skin felt cold and clammy. The tongue was white; and this did not seem so much owing to any fur covering it, as to its being itself of a pale, lifeless colour, as well as the face, and it appeared larger in size than natural. The teeth were clogged with a white fur. Those affected with this fever were subject to faintings, and had a constant uncomfortable languor and listlessness. Most of them had a deep-seated pain in the occiput, and an oppression at the stomach, but without any inclination to vomit. The unfavourable symptoms were _coma_, _delirium_ and a yellowness of the skin. I never remember to have seen _petechiæ_ in any of them. The favourable symptoms were a warm moisture, or a miliary eruption on the skin, and a gentle _diarrhœa_, which, however,