Worms have played a more important part in the history of the world than humans would at first suppose.

Man, wonderful man, must collapse, into nature's cauldron, he is no deity, he is no exception.

The great variability of all the external differences between the races of man, likewise indicates that they cannot be of much importance; for if important, they would long ago have been either fixed and preserved, or eliminated.

No doubt as long as man and all other animals are viewed as independent creations, an effectual stop is put to our natural desire to investigate as far as possible the causes of Expression.

Farewell Australia! You ... are too great and ambitious for affection, yet not great enough for respect. I leave your shores without sorrow or regret.

It may be doubted whether any character can be named which is distinctive of a race and is constant.