This Fever is reckoned the endemic Distemper of the _West Indies_, of the Coast of _Guinea_, and other Places in the Torrid Zone; but in those warm Countries it appears in a more violent Degree; makes a much more rapid Progress; and proves far more fatal than in our cooler and more temperate Climate. And it is observed to be always most frequent and most fatal where a Country is covered with Wood, or is marshy; and where there are frequent Fogs, and much stagnating Water, which corrupts by the Heat of Summer. In _January_, _February_, and _March_ 1761, we had none of those Remitting Fevers at _Paderborn_. In _April_, some few of the Soldiers, on their Return from the Winter-Expedition into _Hesse-Cassel_, had Fevers attended with bilious Symptoms; but they were rather of the continued, inflammatory Kind, and tending to malignant, than such as could be called remitting. The first Time that I saw much of this Fever, was among the Sick sent to _Bilifield_ in the End of _June_ 1761; soon after the Army took the Field. The Remissions were short, and it partook much of the Nature of the common Inflammatory Fever; and most of them were cured by the antiphlogistic Method. A Day or two before we left this Place, it began to change into the Malignant Hospital Fever, from the Sick being too much crowded. In the Middle of _July_, about Twelve Hundred Sick were sent to the Hospital at _Munster_; and about one-third Part were ill of this Remitting Fever. It did not partake near so much of the inflammatory Nature as at _Bilifield_; the Remissions became much more evident; and it was attended much oftener in the Beginning with bilious Vomiting and Purging; and in some few the Disorder turned to a Dysentery. About eight or nine had it changed into the Hospital Fever, from the Wards in one of the Hospitals being too much crowded; and in some few the Disorder terminated in regular Agues. In _November_ severals were taken ill of it in the Garrison of _Bremen_, which mostly ended in a regular Intermittent, the endemic Distemper of the Place. Towards the End of _December_ we had none of these Remitting Fevers, the Disorders turning more to the inflammatory Kind. In _June_ 1762, this Fever began to appear again among the Sick, sent from the Army, to the Hospital at _Natzungen_; and it continued to be frequent through the Summer and Autumn; and the greatest Part of these Fevers this Year terminated in regular Agues, mostly in Tertians, and were cured by the Bark; whereas the Year before very few terminated this Way.