There is often the widest possible difference in the facility of making reciprocal crosses.

进行相互杂交的便利性通常存在最大可能的差异。

The hybrids, moreover, produced from reciprocal crosses often differ in fertility.

此外，由相互杂交产生的杂交种通常在生育能力方面存在差异。

The diversity of the result in reciprocal crosses between the same two species was long ago observed by Kolreuter.

Kolreuter 很久以前就观察到同一两个物种之间相互杂交结果的多样性。

Gartner, moreover, found that this difference of facility in making reciprocal crosses is extremely common in a lesser degree.

此外，Gartner 发现， 这种相互交叉的便利性差异在较小程度上极为普遍。

It is generally different, and sometimes widely different in reciprocal crosses between the same two species.

它通常是不同的， 有时在相同的两个物种之间的相互杂交中差异很大。

As in reciprocal crosses, the facility of effecting an union is often very far from equal, so it sometimes is in grafting.

就像在相互杂交中一样， 实现结合的便利性通常远非平等， 因此有时在嫁接中也是如此。

He experimented on five forms which are commonly reputed to be varieties, and which he tested by the severest trial, namely, by reciprocal crosses, and he found their mongrel offspring perfectly fertile.

他对通常被认为是变种的五种类型进行了试验， 并通过最严格的试验，即通过相互杂交， 对它们进行了测试， 他发现它们的杂种后代完全可育。