It is scarcely possible to doubt that the love of man has become instinctive in the dog.

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.

... not one living species will transmit its unaltered likeness to a distant futurity.

Man selects only for his own good: Nature only for that of the being which she tends.

We will now discuss in a little more detail the Struggle for Existence.

Man himself cannot express love and humility by external signs, so plainly as does a dog, when with drooping ears, hanging lips, flexuous body, and wagging tail, he meets his beloved master.

It is no valid objection that science as yet throws no light on the far higher problem of the essence or origin of life. Who can explain gravity? No one now objects to following out the results consequent on this unknown element of attraction.