If we suppose any habitual action to become inherited—and it can be shown that this does sometimes happen—then the resemblance between what originally was a habit and an instinct becomes so close as not to be distinguished.

如果我们假设任何习惯性行为可以遗传——可以证明这种情况有时确实会发生——那么最初的习惯和本能之间的相似性就会变得如此接近以至于无法区分。

It can be shown that plants most widely different in habit and general appearance, and having strongly marked differences in every part of the flower, even in the pollen, in the fruit, and in the cotyledons, can be crossed.

可以证明， 在习性和一般外观上差异最大的植物， 以及在花的每一部分，甚至在花粉、 果实和子叶中都具有强烈显着差异的植物， 是可以杂交的。