Kinds of GLASS. Of these materials we have many sorts of glass made, which may principally be distinguished according to their beauty: as the crystal flint glass, the crystal white glass, the green glass, and the bottle glass. Again these several sorts are distinguished by their several uses: as plate or coach glasses, looking glasses, optic glasses, &c. which are made of the first sort. The second sort includes crown glass, toys, phials, drinking-glasses, &c. The third sort is well known by its colour, and the second by its form.