I have been speculating last night what makes a man a discoverer of undiscovered things. As far as I can conjecture the art consists in habitually searching for the causes and meaning of everything which occurs.

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

One general law, leading to the advancement of all organic beings, namely, multiply, vary, let the strongest live and the weakest die.

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.

If every one were cast in the same mould, there would be no such thing as beauty.

It is absurd to talk of one animal being higher than another...we consider those, where the intellectual faculties most developed as the highest. - A bee doubtless would [use] ... instincts as a criteria.

Even people who aren’t geniuses can outthink the rest of mankind if they develop certain thinking habits.