Animals manifestly enjoy excitement, and suffer from annul and may exhibit curiosity.

Multiply, vary, let the strongest live and the weakest die.

Why, if species have descended from other species by insensibly fine gradations, do we not everywhere see innumerable transitional forms.

Every new body of discovery is mathematical in form, because there is no other guidance we can have.

Not one great country can be named, from the polar regions in the north to New Zealand in the south, in which the aborigines do not tattoo themselves.

Thomson's views on the recent age of the world have been for some time one of my sorest troubles.

I shall always feel respect for every one who has written a book, let it be what it may, for I had no idea of the trouble which trying to write common English could cost one—And alas there yet remains the worst part of all correcting the press.