We have also already seen that there is the closest similarity in all respects between first illegitimate unions and first crosses between distinct species.

我们也已经看到， 在不同物种之间的第一次非法结合和第一次杂交之间， 在所有方面都有最接近的相似性。

As the degree of sterility in the latter case depends in an eminent degree on the conditions of life being more or less favourable, so I have found it with illegitimate unions.

由于后一种情况下的不育程度在很大程度上取决于生活条件的优劣， 所以我发现它与非法结合有关。