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.

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.

He who believes that each being has been created as we now see it, must occasionally have felt surprise when he has met with an animal having habits and structure not at all in agreement.

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