How, then, does the lesser difference between varieties become augmented into the greater difference between species?

那么，变种之间的较小差异如何扩大到物种之间的较大差异呢？

We will now look a little closer at the probable nature of the differences between species which induce sterility in first crosses and in hybrids.

我们现在将更仔细地研究在第一次杂交和杂交中诱导不育的物种之间差异的可能性质。

Thus the small differences distinguishing varieties of the same species, steadily tend to increase, till they equal the greater differences between species of the same genus, or even of distinct genera.

因此，区分同一物种的变种的微小差异会稳步增加， 直到它们等于同一属或什至不同属的物种之间的更大差异。

In looking at many small points of difference between species, which, as far as our ignorance permits us to judge, seem quite unimportant, we must not forget that climate, food, etc., have no doubt produced some direct effect.

在观察物种之间的许多小差异点时， 就我们的无知而言，这些差异似乎并不重要， 我们不能忘记气候， 食物等无疑产生了一些直接影响。

But whenever we have the means of instituting a comparison, the same laws appear to have acted in producing the lesser differences between varieties of the same species, and the greater differences between species of the same genus.

但只要我们有办法进行比较，相同的规律似乎在同一物种的变种之间产生了较小的差异，并且同一属的物种之间的差异更大。