And if, where the least particle of the body divided is as big as a mustard seed, a void space equal to the bulk of a mustard seed be requisite to make room for the free motion of the parts of the divided body within the bounds of its superficies, where the particles of matter are less than a mustard seed, there must also be a space void of solid matter as big as part of a mustard seed; for if it hold in the one it will hold in the other, and so on.