Book,  Paragraph

1  IV,  2| which the amount of solid or plenum is in excess of the solids
2  IV,  2|      to move upward and of a plenum to move downward, and therefore
3  IV,  2|  further, the reason why the plenum and the void are not eternally
4  IV,  4| heaviness to the presence of plenum and lightness to that of
5  IV,  5|    instance, the void or the plenum or extension or the triangles,
6  IV,  5|    two asserted are void and plenum. Fire, then, as moving upward,
7  IV,  5|   earth, as moving downward, plenum; and in air, it will be
8  IV,  5|      downward because it has plenum, so air goes to its own