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Before an illness, as I mentioned above, there appear some signs of its approach. All of them have this in common, that the body alters from its ordinary state; and not only for the worse, but even for the better. For this reason, if one has become more plump, and looks better, and of a more florid complexion than usual, he ought to hold these advantages suspected. For because these things can neither continue at a stay, nor admit further improvement, they generally run backward very fast, like some heavy body tumbling down. But it is a worse sign, when one is emaciated contrary to his natural habit, and has lost his colour and comeliness: because bodies redundant can allow something to be carried off by a distemper; the deficient have not wherewithal to bear the force of the distemper itself. Besides there is cause to be presently alarmed, if the limbs are heavy; if frequent ulcers break out; if the body has grown hotter than common; if sleep be too heavy; if the dreams are tumultuous; if one awakes oftner than usual, and then falls asleep again; if the body of a person asleep sweats in some parts contrary to custom, especially if that be about the breast, or neck, or legs, or knees, or hips; also if the mind is languid; if there is a reluctance to speaking and motion; if the body be indisposed to action; if the præcordia are pained, or the whole breast, or which happens in most people, the head; if the mouth is filled with saliva; if the eyes feel pain in turning; if the temples be strait bound(5): if the limbs have shudderings; if the breathing is difficult; if the arteries in the forehead are dilated and beat strong; if there be frequent yawnings; if the knees feel tired, or the whole body be afflicted with a lassitude. Several of these things often, some of them always, precede a fever. This, however, ought to be first considered, whether any of these happen frequently to a person without any consequent uneasiness. For there are some peculiarities in the constitutions of particular persons, without the knowledge of which, it is not easy to prognosticate what is to happen. With reason therefore a man is free from apprehensions about those things, which he has often escaped without danger: he only is justly uneasy, to whom these appearances are new, or who has never been secured from their bad effects without proper precautions.