the venom; and when the contagious miasms arrive at their highest degree, the malignant fever ariseth. The spirits are then knocked down, and the marks of the enemies weapons, the spots, &c. appear. This (the Doctor continued) is the case of your lady, and therefore the thing to be done is, to make the malignant tack about to the mild, and produce an extinction of the ferment, and relief of the symptoms. This I endeavour to do by alexipharmics and vesicatories, and by subduing the poison by the bark and the warmer antidotes. Thus did my Doctor marshal

shal his animal spirits, fight them against the enemy venom, to great disadvantage. If his talk was not romance, it was plain his spirits were routed, and venom was getting the day. His alexipharmics and warm antidotes, were good for nothing. The malady encreased.
This being the case, I sent again in haste for a fourth doctor, a man of greater learning than the other three, and therefore, in opinion, opposite, and against their management of the fever. This great man was Dr. Frost. He was a mechanician, and affirmed that, the solid parts of the human body are subjected to the rules of geometry, and the fluids to the hydrostatics; and therefore, to keep the machine in right order, that is, in a state of health, an aequilibrium must be maintained, or restored, if destroyed. The balance must not turn to one side or the other. To restore sanity in acute cases, and in chronic too, our business is to prevent the vessels being elevated or deprest beyond the standard of nature: when either happens, the division of the blood is increased, the motion is augmented, and so beget a fever. There cannot be an inordinate elevation of the oily or fiery parts of the blood, till the vessels vibrate above the standard of nature.
In a slight fever, the blood increases but little above the balance; but if more than one day; turns to a synochus, which is but the same

fever augmented beyond the balance of nature. This turns to a putrid synochus, and this to a causus. This is the case of your lady. From an elevated contraction (the Doctor contitinued, to my amazement,) her blood obtains a greater force and motion; hence greater division, hence an increase of quantity and fluidity: and thus from greater division, motion and quantity increased, arises that heat and thirst, with the other concomitant symptoms of her fever; for the blood dividing faster than it can be