For it oblige me to renounce my allegiance to the Darwinian theory of the Ascent of Man from the Lower Animal to be named the Descent of Man from the Higher Animal.

• 达尔文认为人是由低等动物进化来的，对此我曾深信不疑，而现在我却不得不把这一理论改为“人是由高等动物退化来的”。