Book, Paragraph

 1   I,  3|     of the heavens and driven downwards in spite of itself.~Shooting-stars
 2   I,  4|     is clear. They are thrown downwards because the condensation
 3   I,  4|   which propels them inclines downwards. Thunderbolts fall downwards
 4   I,  4|  downwards. Thunderbolts fall downwards for the same reason: their
 5   I,  4|    and causes it to be thrown downwards. The motion is upwards or
 6   I,  4|      The motion is upwards or downwards or sideways according to
 7   I,  4| involved, a compulsory motion downwards and a natural motion upwards,
 8  II,  9|      analogous phenomena move downwards in spite of the fact that
 9 III,  1|    cloud burns as it is drawn downwards, that is, when the exhalation
10  IV,  9|        but only in part) both downwards and sideways with one and