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. Ice for example, or any other solidified
fluid, is spoken of as being actually and accidentally solid, while
potentially and essentially it is fluid. Similarly earth and ashes and
the like, when mixed with water, are actually and accidentally
fluid, but potentially and essentially are solid. Now separate the
constituents in such a mixture and you have on the one hand the watery
components to which its fluidity was due, and these are both
actually and potentially fluid, and on the other hand the earthy
components, and these are in every way solid; and it is to bodies that
are solid in this complete manner that the term 'solid' is most
properly and absolutely applicable. So also the opposite term
'fluld' is strictly and absolutely applicable to that only which is
both potentially and actually fluid. The same remark applies also to
hot bodies and to cold.
These distinctions, then, being laid down, it is plain that blood is
essentially hot in so far as that heat is connoted in its name; just
as if boiling water were denoted by a single term, boiling would be
connoted in that term. But the substratum of blood, that which it is
in substance while it is blood in form, is not hot. Blood then in a
certain sense is essentially hot, and in another sense is not so.
For heat is included in the definition of blood, just as whiteness
is included in the definition of a white man, and so far therefore
blood is essentially hot
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