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Of letting Blood.
THere are more Diseases come in having too much Blood, than too little: for when the Veins are too full, the Blood hath no liberty to run out, and for want of Motion corrupts, which Corruption bursts out into Small-Pox, Fistaloes, Kings Evils, and many such like Diseases. But if the Humour thrusts not Outwards, it corrupts the Inward Parts, as, the Liver, the Lungs, or else breeds Imposthumes, and many such Diseases. But if there be much Blood, and thin, then by the agitation it grows hot, or else by the many Spirits in much Blood, it begets too much Motion, Motion Heat, and Heat and Motion fires the Blood, and inflames the Spirits, which causeth Feavers of all sorts, Frenzies, and Consumptions; for there may be as well too much Motion in the Body, as too little. But when the Parts of the Body are congeal'd, or tyed up with Cold, then the Blood * 1.1 cannot run, nor the Spirits work, but Motion ceaseth, and the ceasing of Natural Motion is Death. Or if the Blood run too fast about, and the Spirits work too hard, by reason of too much Heat, they wast out themselves, by reason of too much Labour, * 1.2 and so are worn out, like the Wheels of a Clock; for the Clock ceaseth to go, when the Wheels are broken.