The lessons of science should be experimental also. The sight of a planet through a telescope is worth all the course on astronomy; the shock of the electric spark in the elbow outvalues all theories; the taste of the nitrous oxide, the firing of an artificial volcano, are better than volumes of chemistry.

Pay no heed to the average photographer's remarks upon "flat" and "weak" negatives. Probably he is flat, weak, stale, and unprofitable; your negative may be first-rate, and probably is if he does not approve of it.

Fate, then, is a name for facts not yet passed under the fire of thought; for causes which are unpenetrated.

I remember the thought which occurred to me when some ingenious and spiritual foreigners came to America, was, Have you been victimized in being brought hither?--or, prior to that, answer me this, "Are you victimizable?

Concentration is the secret of srength.

I wish the days to be as centuries, loaded, fragrant. Now we reckon them as bank-days, by some debt which is to be paid us, or which we are to pay, or some pleasure we are to taste.

In a cabinet of natural history, we become sensible of a certain occult recognition and sympathy in regard to the most unwieldy and eccentric forms of beast, fish, and insect.