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For in fact fire never becomes cold; whereas water invariably does so.
Boiling water, again, is hotter to the touch than oil; yet it gets
cold and solid more rapidly than this other fluid. Blood, again, is
hotter to the touch than either water or oil, and yet coagulates
before them. Iron, again, and stones and other similar bodies are
longer in getting heated than water, but when once heated burn other
substances with a much greater intensity. Another distinction is this.
In some of the bodies which are called hot the heat is derived from
without, while in others it belongs to the bodies themselves; and it
makes a most important difference whether the heat has the former or
the latter origin. For to call that one of two bodies the hotter,
which is possessed of heat, we may almost say, accidentally and not of
its own essence, is very much the same thing as if, finding that
some man in a fever was a musician, one were to say that musicians are
hotter than healthy men. Of that which is hot per se and that which is
hot per accidens, the former is the slower to cool, while not rarely
the latter is the hotter to the touch. The former again is the more
burning of the two-flame, for instance, as compared with boiling
water-while the latter, as the boiling water, which is hot per
accidens, is the more heating to the touch. From all this it is
clear that it is no simple matter to decide which of two bodies is the
hotter
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