unless by solution in Menstruums they be reduced into very small
Particles, and then they become transparent.


PROP. III.

_Between the parts of opake and colour'd Bodies are many Spaces, either
empty, or replenish'd with Mediums of other Densities; as Water between
the tinging Corpuscles wherewith any Liquor is impregnated, Air between
the aqueous Globules that constitute Clouds or Mists; and for the most