Book,  Paragraph

 1   I,  2 |         as we term it, is either straight or circular or a combination
 2   I,  2 |      this is that these two, the straight and the circular line, are
 3   I,  2 |      downward movements are in a straight line, "upward" meaning motion
 4   I,  2 |       This cannot be said of any straight line:-not of an infinite
 5   I,  2 |    circular movement is prior to straight, and movement in a straight
 6   I,  2 |      straight, and movement in a straight line belongs to simple bodies-fire
 7   I,  2 |        simple bodies-fire moving straight upward and earthy bodies
 8   I,  2 |         upward and earthy bodies straight downward towards the centre-since
 9   I,  2 |         see that fire moves in a straight line away from the centre.
10   I,  3 |        the centre. Movement in a straight line certainly does not
11   I,  3 |    motions, the circular and the straight, the latter being subdivided
12   I,  4 |   obvious tendency to oppose the straight line to the circular. For
13   I,  4 |       unity in opposition to the straight. And so, if there is a contrary
14   I,  4 |     circular motion, motion in a straight line must be recognized
15   I,  4 |      points as the length of the straight line which joins them. It
16   I,  7 |        place, there is no other (straight) movement beyond those mentioned:
17   I,  7 |       can the infinite move in a straight line. For there would have
18  II,  4 |        is always possible to the straight line but never to the circular,
19  II,  4 |     extremities be joined by the straight line BC. The line AD, drawn
20  II,  13|   concealed by the earth shows a straight and not a curved edge, whereas
21  II,  13| apparently small circles appears straight. Such an appearance ought
22  II,  14|       fact every part moves in a straight line to the centre. Being,
23  II,  14|     bodies forcibly thrown quite straight upward return to the point
24  II,  14|          shows are of every kind straight, gibbous, and concave-but