CHAPTER XIII. OF THOSE THINGS THAT ARE LEAST IN NATURE.
Empedocles, before the four elements, introduceth the most minute bodies which resemble elements; but they did exist before the elements, having similar parts and orbicular.
Heraclitus brings in the smallest fragments, and those indivisible.
CHAPTER XIV. OF FIGURES.
A figure is the exterior appearance, the circumscription, and the boundary of a body.
The Pythagoreans say that the bodies of the four elements are spherical, fire being in the supremest place only excepted, whose figure is conical.