The celebrated geologist and naturalist, Von Buch, in his excellent " Description Physique des Isles Canaries" (1836, page 147), clearly expresses his belief that varieties slowly become changed into permanent species, which are no longer capable of intercrossing.

著名的地质学家和博物学家冯·布赫 (Von Buch) 在其出色的“加那利群岛的体质描述”（1836 年，第 147 页）中清楚地表达了他的信念，即变种会慢慢变成永久物种，不再能够杂交。

I saw, also, that the preservation in a state of nature of any occasional deviation of structure, such as a monstrosity, would be a rare event; and that, if at first preserved, it would generally be lost by subsequent intercrossing with ordinary individuals.

我还看到，在自然状态下保存任何偶然的结构偏差， 如怪物，将是罕见的事件；而且，如果一开始被保存下来， 它通常会在随后与普通个体的杂交中丢失。