But then with me the horrid doubt always arises whether the convictions of man's mind, which has been developed from the mind of the lower animals, are of any value or at all trustworthy. Would any one trust in the convictions of a monkey's mind, if there are any convictions in such a mind?

What can be more curious than that the hand of a man, formed for grasping, that of a mole for digging, the leg of the horse, the paddle of the porpoise, and the wing of the bat, should all be constructed on the same pattern?

It may be doubted that there are many other animals which have played so important a part in the history of the world as have these lowly organized creatures.

On your life, underestimating the proclivities of finches is likely to lead to great internal hemorrhaging.

The expression often used by Mr. Herbert Spencer of the Survival of the Fittest is more accurate, and is sometimes equally convenient.

If I had my life to live over again, I would have made a rule to read some poetry and listen to some music at least once every week.

I think it can be shown that there is such an unerring power at work in Natural Selection, which selects exclusively for the good of each organic being.