Book,  Paragraph

 1   I,  3 |            these have their testes internal near the loin, and two ducts
 2   I,  4 |         large. When the testes are internal the act of copulation is
 3   I,  5 |   sometimes external and sometimes internal.~
 4   I,  12|           Why is the uterus always internal, but the testes sometimes
 5   I,  12|           but the testes sometimes internal, sometimes external? The
 6   I,  12|            the uterus always being internal is that in this is contained
 7   I,  12|           the testes must needs be internal. Therefore they are so in
 8   I,  12|     animals for their testes being internal besides those previously
 9   I,  12|           the same reason they are internal in the elephant and hedgehog,
10   I,  13|            Now in those which have internal testes, the ducts are fixed
11  II,  1 |     suppose that any of either the internal organs or the other parts
12  II,  2 |           air in it because of the internal heat; afterwards, when the
13  II,  4 |       first differentiated and the internal later, are much mistaken;
14  II,  6 |         this, as said already, the internal parts come into being before
15  II,  6 |            bones are formed by the internal heat as the moisture dries,
16  IV,  4 | deficiencies are found also in the internal parts, animals either not
17   V,  2 |          some quadrupeds, with the internal spiral passage long; these