Book,  Paragraph

 1   I,  23| though both are the same in species, as with man and horse.
 2  II,  1 |     is possible for it as a species. This is why there is always
 3  II,  3 |   peculiar character of the species is the end of the generation
 4  II,  7 |   from animals of different species uniting with one another
 5  II,  8 | male and female of the same species there are born in course
 6  II,  8 | male and female of the same species as the parents, e.g. male
 7  II,  8 |   From parents of different species is born a young one different
 8  II,  8 |    a young one different in species; thus if a dog is different
 9  II,  8 |    and are not different in species from one another, and (2)
10  II,  8 |  and these are different in species from mules, it is impossible
11  II,  8 | male and female of the same species is also of the same species,
12  II,  8 | species is also of the same species, and (2) a mule cannot be,
13  II,  8 |   many animals of different species are fertile with one another,
14  II,  8 |     when mated with its own species. Thus when the difficulty
15  II,  8 |  when united with their own species they with difficulty produce
16 III,  1 |   we find also in the human species; for the nourishment which