If men were to be destroyed and the books they have written were to be transmitted to a new race of creatures, in a new world, what kind of record would be found in them of so remarkable a phenomenon as the rainbow?

A man's interest in a single bluebird is worth more than a complete but dry list of the fauna and flora of a town.

The eye which can appreciate the naked and absolute beauty of a scientific truth is far more rare than that which is attracted by a moral one.

Rise free from care before the dawn, and seek adventures.

I saw deep in the eyes of the animals the human soul look out upon me. I saw where it was born deep down under feathers and fur, or condemned for a while to roam four-footed among the brambles,I caught the clinging mute glance of the prisoner and swore that I would be faithful.

There is in my nature, methinks, a singular yearning toward all wildness.

I am not afraid that I shall exaggerate the value and significance of life, but that I shall not be up to the occasion which it is.