5. Riverius describes a pestilential fever which prevailed at Montpellier, in the year 1623, which carried off one half of all who were affected by it[82]. After many unsuccessful attempts to cure it, this judicious physician prescribed the loss of _two_ or _three_ ounces of blood. The pulse rose with this small evacuation. Three or four hours afterwards he drew six ounces of blood from his patients, and with the same good effect. The next day he gave a purge, which, he says, rescued his patients from the grave. All whom he treated in this manner recovered. The whole history of this epidemic is highly interesting, from its agreeing with our late epidemic in so many of its symptoms, more especially as they appeared in the different states of the pulse. [82] De Febre Pestilenti, vol. ii. p. 145, 146, and 147. An old and intelligent citizen of Philadelphia, who remembers the yellow fever of 1741, says that when it first made its appearance bleeding was attended with fatal consequences. It was laid aside afterwards, and the disease prevailed with great mortality until it was checked by the cold weather. Had blood been drawn in the manner mentioned by Riverius, or had it been drawn in the usual way, after the abstraction of the stimulus of heat by the cool weather, the disease might probably have been subdued, and the remedy of blood-letting thereby have recovered its character. Dr. Hodges has another remark, in his account of the plague in London in the year 1665, which is still more to our purpose than the one which I have quoted from it upon this subject. He says that "bleeding, as a preventive of the plague, was only safe and useful when the blood was drawn by a _small_ orifice, and a _small_ quantity taken at _different_ times[83]." [83] Page 209. I have remarked, in the history of this fever, that it was often cured on the first or second day by a copious sweat. The Rev. Mr. Ustick was one among many whom I could mention, who were saved from a violent attack of the fever by this evacuation. It would be absurd to suppose that the miasmata which produced the disease were discharged in this manner from the body. The sweat seemed to cure the fever only by lessening the quantity of the fluids, and thus _gradually_ removing the depression of the system. The profuse sweats which sometimes cure the plague, as well as the disease which is brought on by the bite of poisonous snakes, seem to act in the same way.