正如几何学最自然的起点是数学点，在观察和自然历史中采用同样的方法也最真实、简单且富有教益。
As in geometry the most natural way of beginning is from a mathematical point, so is the same method in observations and natural history the most genuine, simple, and instructive.
"The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter."
"The past is always with us, for it feeds the present."
世界充满了故事，但所有的故事都是一个。