A man's own addition to what he learns is cement to bind an otherwise loose heap of stones into a structure of unity, strength, and use.

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

Ten builders rear an arch, each in turn lifting it higher; but it is the tenth man, who drops in the keystone, who hears our huzzas.

A man's own addition to what he learns is cement to bind an otherwise loose heap of stones into a structure of unity, strength, and use.

No gun is perfectly true. So the marksman, that he may hit the bull's-eye, points elsewhere.

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

Form may be of more account than substance. A lens of ice will focus a solar beam to a blaze.