A calculating engine is one of the most intricate forms of mechanism, a telegraph key one of the simplest. But compare their value.

Discovery begins by finding the discoverer.

Nothing cools so fast as undue enthusiasm. Water that has boiled freezes sooner than any other.

A tree nowhere offers a straight line or a regular curve, but who doubts that root, trunk, boughs, and leaves embody geometry?

Boundaries which mark off one field of science from another are purely artificial, are set up only for temporary convenience. Let chemists and physicists dig deep enough, and they reach common ground.

Evolution pays and that is why there is evolution

We despair of changing the habits of men, still we would alter institutions, the habits of millions of men.