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But though friction may be used in the decline of an illness, yet it is never to be practised in the increase of a fever; but if possible, when the body is entirely free of it; if that can’t be done, at least when there is a remission. It ought also to be performed sometimes over the whole body, as when we would have an infirm person take on flesh; sometimes in particular parts, either because the weakness of that part itself, or of some other, requires it. For both inveterate pains of the head are mitigated by the friction of it (yet not during their violence) and any paralytic limb is strengthened by rubbing it: but much more commonly, when one part is pained, a different one is to be rubbed; and particularly, when we want to make a derivation from the upper or middle parts of the body; and with this intention we rub the extremities. And these people are not to be regarded, who prescribe to a certain number, how often a person is to be rubbed: for that is to be estimated from his strength. Thus if one is very weak, fifty times may be sufficient: if of a more robust habit, it may be done two hundred times. And then in different proportions betwixt these two according to the strength. Whence it also happens, that the motion of the hands in friction must be less frequent in a woman than a man; less frequent in a boy or an old man, than a young man. Lastly, if particular parts are rubbed, they require much and strong friction. For the whole body cannot be quickly weakened by a part, and there is a necessity for dissipating as much of the matter as we can, whether the intention be to relieve the part we brush, or another by means of it. But where a weakness of the whole body requires this treatment all over, it ought to be shorter and more mild; so as only to soften the surface of the skin, to render it more apt to receive new matter from fresh nourishment. A patient is known to be in a bad situation, when the surface of his body is cold, and the internal part is hot with a concomitant thirst, as I observed above. But even in this case friction is the only remedy, which, if it have brought out the heat, may make way for the use of some medicine.