1. The subject of the present consideration is mixture to the point
of total penetration of the different bodies. This has been explained
in two ways: that the two liquids are mingled so as mutually to
interpenetrate each other totally, or that only one of them penetrates
the other. The difference between these two theories is of small
importance. First we must set aside the opinion of (Anaxagoras and
Democritus[58]), who explain mixture as a juxtaposition, because this
is a crude combination, rather than a mixture.[59] Mixture should
render the whole homogeneous, so that even the smallest molecules might
each be composed of the various elements of the mixture.