Book,  Paragraph

 1   I,  4 | investigate the causes of their existence, we must first grasp the
 2  II,  1 |     whilst others admit of both existence and non-existence. But (
 3  II,  1 |       not eternal does admit of existence and non-existence, and can
 4  II,  1 |       much for the cause of the existence of the two sexes. Some animals
 5 III,  10|      why, if new bees come into existence when the germs are transported,
 6 III,  10|        kinds always continue in existence and none of them fails,
 7  IV,  3 |        nearer to his individual existence than is his animalhood.
 8  IV,  3 |       for this is the only true existence. And the offspring is produced
 9  IV,  3 |         this latter is the true existence. Therefore it is from the
10  IV,  3 |        monstrosity to come into existence—I mean one animal in another—
11  IV,  4 |        needed for beginning the existence of a single animal, it is