Of these causes that which contributes most to epilepsy, the disease of which I set out to speak, is a condition when the flesh is so melted by the noxious influence of fire as to form a thick and foaming humour. This generates a vapour, and the heat of the air thus compressed within the body causes a white and eruptive ferment. If this ferment succeeds in escaping from the body, it is dispersed in a manner that is repulsive rather than dangerous. For it causes an eczema to break out upon the surface of the skin of the breast and mottles it with all kinds of blotches. But the person to whom this happens is never again attacked with epilepsy, and so he rids himself of a most sore disease of the spirit at the price of a slight disfigurement of the body.

But if, on the other hand, this dangerous corruption be contained within the body and mingle with the black bile, and so run fiercely through every vein, and then working its way upwards to the head flood the brain with its destructive stream, it straightway ............