It is a fatal fault to reason whilst observing, though so necessary beforehand and so useful afterwards.

I am dying by inches, from not having any body to talk to about insects.

...conscience looks backwards and judges past actions, inducing that kind of dissatisfaction, which if weak we call regret, and if severe remorse.

In regard to the amount of difference between the races, we must make some allowance for our nice powers of discrimination gained by a long habit of observing ourselves.

Nothing can be more improving to a young naturalist, than a journey in a distant country.

Such simple instincts as bees making a beehive could be sufficient to overthrow my whole theory.

After my return to England it appeared to me that by following the example of Lyell in Geology, and by collecting all facts which bore in any way on the variation of animals and plants under domestication and nature, some light might perhaps be thrown on the whole subject.