Book,  Paragraph

 1   I,  1 |     principles of this sort of substance, as many as they may be.
 2   I,  2 |       is in nature some bodily substance other than the formations
 3   I,  3 |       about the primary bodily substance was well said. The mere
 4   I,  9 |     then, we call "heaven" the substance of the extreme circumference
 5  II,  4 |        most appropriate to its substance and also by nature primary.~
 6  II,  4 |   regularity and finish as the substance of the enveloping body;
 7  II,  7 |     should be composed of that substance in which their path lies,
 8  II,  7 |     have that effect on air, a substance which is closer to fire
 9  II,  12| circular motion, in respect of substance and shape, movement and
10  II,  13|     that the naturally lighter substance lies below the heavier?
11 III,  1 | concerns bodies: for a natural substance is either a body or a thing
12 III,  1 |        of being other than the substance of things perceived; and
13 III,  3 |     first explain what kind of substance an element is. An element,
14 III,  4 |       assuming that the atomic substance was a sort of master-seed
15  IV,  2 |       size are all made of one substance, it implies, equally with