putting between it and every other an impassable gulf, do not always lie on the surface like pebbles on the beach, to be picked up; but rather like gold or gems, in hidden veins or mines, to be dug up. No other book so bears, or so rewards, patient, untiring study. He who searches discovers, even in oft-trodden ground, what is surprisingly new, beautiful, valuable; and such discovery has no limit. The field is inexhaustible in wealth; exploration becomes explanation, with ever fresh disclosures of