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THE SECOND BOOK. (Book 2)
PART I. OF DISEASES.
CHAP. I. Of the nature of a Disease.
WHereas we have hither treated of those things that are incident to the body according to Nature, * 1.1 and so have discoursed about health; now I will speake of those things that are preter-natural or contrary to Nature, (for I do not intend to make any distinction betwixt these) They are in number three, a Disease, the cause of a Disease, and Symptomes: in the handling whereof the Pathological part of Physick is delivered.
And first for what belongs to a disease; Although as the name of health is generally attributed to all things that happen to a man ac∣cording to nature, so the name of a disease is given to all things that befal a man contrary to nature, and those are said to be morbi∣fick: yet if we may speak properly, these three, a Disease, the cause of a Disease, and Symptomes, as they differ in the thing, so they may be discerned by their names also.
But whereas a disease is conrrary to nature; * 1.2 but health is that power of acting which is to be performed according to nature: a dis∣ease is an impotency of performing natural actions; and as those who are apt to do those things which are according to nature, are said to be sound; so those are deservedly said to be sick, who are un∣apt to perform those actions.
Moreover the Subject of a disease, as also of health, * 1.3 is only the living parts of a body, as being those to which alone a power of un∣dergoing natural actions is given; But all those things which are not in the number of the living, as humors and other things, which are not able to perform natural actions in a man, cannot be the subject of a disease.
The cause of a Disease or of impotency to perform actions, is an