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单词 fourth species
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Something analogous occurs in grafting; for Thouin found that three species of Robinia, which seeded freely on their own roots, and which could be grafted with no great difficulty on a fourth species, when thus grafted were rendered barren.

嫁接中会发生类似的事情; 因为 Thouin 发现三种刺槐,它们在自己的根上自由播种, 并且可以很容易地嫁接到第四种, 当这样嫁接时变得不育。

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