Epitome of the Complete Works of Galen

is almost suddenly extinguished. Therefore, those who are so affected are immediately deprived of both motion and sensation: which Hippocrates seems to have signified, saying: the interceptions of the veins (that is, the arteries) immediately snatch away the voice. Therefore, the heat of the heart has commerce with the air surrounding us through the passage of the throat. If you block this path, you will immediately suffocate the animal.
The heat of the heart is ventilated by the dilation of the arteries; it is purged by their contraction.

However, the heat that is in all the arteries transpires through the heart, as far as it has a path to the throat, and through the entire skin, into the ambient air; and it is indeed ventilated while the arteries are lifted; it is purged of soot while they are contracted. And by both of these, its own natural measure is preserved. If, therefore, the arteries are deprived of such a vicissitude of motion because of constriction, it is necessary for the heat to be extinguished, and for the body, having been completely cooled, to die. But if the body, being filled with fuliginous excrement, is constricted, either a fever will be excited, or the innate heat will be extinguished; but if it is filled with the halitous steamy/vaporous vapor of blood, either the body itself will become plethoric, or its heat will increase. But just as constriction is more often the cause of refrigeration, so also is rarefaction,
Rarefaction, by what reason it cools.

when it happens more than is useful, it dissipates and scatters the innate heat and makes the body colder. But, just as constriction itself is sometimes accustomed to happen to the whole body, and sometimes to some part of it: in the same way, rarefaction also behaves. Furthermore, those things that are applied from the outside can render the part itself either rare or constipated. But the tightest bonds both deprive the member of life and intensely cool it. But it is now timely for me to speak about dry affections: If someone is exhaled much more than is appropriate for the amount of food consumed, and uses drier foods, he will easily slip into a dry sickness: especially if he is tormented by cares and anxieties, as well as by sleeplessness. The dry temperament of the air, baths that possess a drying power, and also drugs which, administered inside and out, possess the faculty of drying, dry out bodies. Humid diseases