Book,  Paragraph

 1   I,  2 |          it. The most conclusive proof of this is drawn from considering
 2   I,  18|        children to parents is no proof that the semen comes from
 3   I,  18|          plant.~But the greatest proof of all is derived from observations
 4   I,  18| departure from Nature.~A further proof that it is not a waste-product,
 5   I,  19|       spermatic secretion.~And a proof that the female does not
 6   I,  20|         in plants and animals. A proof of this is that animals
 7   I,  21| oviparous fishes is the greatest proof that neither does the semen
 8  II,  4 |         with men; but this is no proof, for the same thing happens
 9  II,  4 |        draws it within itself. A proof of this is that pessaries,
10  II,  5 |       however, we have as yet no proof worthy of credit. Again,
11  II,  6 |          cause, there will be no proof of any eternal truth whatever;
12  II,  6 |       but we see that there is a proof of many such, whether by "
13  II,  6 |       nevertheless a cause and a proof can be given for these truths.
14  II,  6 |        by another method, not by proof, that we acquire knowledge
15  II,  6 |      membrane round the brain. A proof of this is that, apart from
16  II,  7 |         generative secretions; a proof of this is that it alone
17  II,  8 |    conceive.~Perhaps an abstract proof might appear to be more
18  II,  8 |       semen also must be cold. A proof of this is that if a horse
19 III,  5 |                              5~A proof that these fish also are
20 III,  11|         in them. Here is another proof that such animals do not
21 III,  11|      savoury at these periods. A proof that this substance is not
22  IV,  1 |         rather than the other; a proof of this is that many animals
23  IV,  4 |        one, two, or many toes. A proof of this is that the elephant
24   V,  1 |          from distant objects. A proof of this is that animals
25   V,  3 |          climate is the cause. A proof of this is also what happens
26   V,  4 |          are a form of decay). A proof that this is so is this:
27   V,  5 |        think, a withering. (1) A proof of the former statement
28   V,  8 |      them appear more quickly. A proof of this is that even in
29   V,  8 |          enough to grow teeth. A proof of this is that even the