No human pursuit achieves dignity unless it can be called work, and when you can experience a physical loneliness for the tools of your trade, you see that the other things - the experiments, the irrelevant vocations, the vanities you used to hold - were false to you.

The way to find a needle in a haystack is to sit down.

In the family of continents, Africa is the silent, the brooding sister, courted for centuries by knight-errant empires - rejecting them one by one and severally, because she is too sage and a little bored with the importunity of it all.

I know animals more gallant than the African warthog, but none more courageous. He is the peasant of the plains - the drab and dowdy digger in the earth. He is the uncomely but intrepid defender of family, home, and bourgeois convention, and he will fight anything of any size that intrudes upon his smug existence. ... His eyes are small and lightless and capable of but one expression - suspicion. What he does not understand, he suspects, and what he suspects, he fights.

We fly, but we have not 'conquered' the air. Nature presides in all her dignity, permitting us the study and the use of such of her forces as we may understand. It is when we presume to intimacy, having been granted only tolerance, that the harsh stick fall across our impudent knuckles and we rub the pain, staring upward, startled by our ignorance.

I suppose if there were a part of the world in which mastodon still lived, somebody would design a new gun, and men, in their eternal impudence, would hunt mastodon as they now hunt elephant. Impudence seems to be the word. At least David and Goliath were of the same species, but, to an elephant, a man can only be a midge with a deathly sting.

Roots of the weed sucked first life from the genesis of earth and hold the essence of it still. Always the weed returns; the cultured plant retreats before it.