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The Complete Herbal To which is now added, upwards of one...

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The care of the ancient Physicians was such that they did not labour to hide from, but impart to posterity, not only the temperature of medicines in general, but also their degrees in temperature, that so the distempered part may be brought to its temperature, and no further; for all things which are of a contrary temperature, conduce not to cure, but the strength of the contrariety must be observed, that so the medicine may be neither weaker nor stronger, than just to take away the distemper; for if the distemper be but meanly hot, and you apply a medicine cold in the fourth degree, it is true, you may soon remove that distemper of heat, and bring another of cold twice as bad. Galen, de simp. med. facul. lib. 3. cap. 12.
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Then, secondly, Not only the distemper itself, but also the part of the body distempered must be heeded; for if the head be distempered by heat, and you give such medicines as cool the heart or liver, you will bring another disease, and not cure the former.
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The degrees then of temperature are to be diligently heeded, which antient physicians have concluded to be four in the qualities, viz. heat and cold, of each we shall speak a word or two severally.

Source attribution

The Complete Herbal To which is now added, upwards of one hundred additional herbs, with a display of their medicinal and occult qualities physically applied to the cure of all disorders incident to mankind: to which are now first annexed, the English physician enlarged, and key to Physic., Project Gutenberg eBook #49513

Of Medicines Temperate. Of Medicines hot in the first degree.