A grand and almost untrodden field of inquiry will be opened, on the causes and laws of variation, on correlation of growth, on the effects of use and disuse, on the direct actions of external conditions, and so forth.

As for a future life, every man must judge for himself between conflicting vague probabilities.

If I had life to live over again, I would give my life to poetry, to music, to literature, and to art to make life richer and happier. In my youth I steeled myself against them and thought them so much waste.

Many kinds of monkeys have a strong taste for tea, coffee and spirituous liqueurs.

Everything in nature is the result of fixed laws.

An agnostic would be the more correct description of my state of mind.

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.