Here was the seat of an ancient civilization, which was in the zenith of its power many centuries before Christ. The changes that have passed over the earth since that time are far more wonderful than any ascribed to the wand of the magician. Nations have come and gone, and the land of the Pharaohs has become an inheritance for strangers; new sciences have enriched human life, and the fair structure of modern civilization has arisen on the ruins of the past. Many centuries, with their burden of human hopes and fears, have sped away into the past, since “Hundred-gated Thebes” sheltered her teeming population, where now are but a mournful group of ruins. Yet to-day, far below the remorseless sands of her desert, we find the rude flint-flakes that require us to carry back the time of man’s first appearance in Egypt to a past so remote that her stately ruins become a thing of yesterday in comparison to them. In the New World, mysterious mounds and gigantic earth-works arrest our attention. Here we find deserted mines, and there we can trace the sites of ancient camps and fortifications. The Indians of the prairies seem to be intruders on a fairer civilization. We find here evidences of a teeming population. In the presence of their imposing ruins, we can not think that nomadic savages built them. They give evidences rather of a people having fixed habitations and seem to imply the possession of a higher civilization than that of the Indians. These questions demand solution; but how shall we solve the problem? Save here and there a deserted camp, or a burial mound, containing perhaps articles of use or adornment, all traces have vanished. Their earth-works and mounds are being rapidly leveled by the plow of modern times, and the scholar of the future can only learn from books of their mysterious builders. In Mexico, and farther south, we find the ruins of great cities. To the student of antiquity, these far surpass in interest the ruined cities of the Nile or Euphrates valley. Babylon of old, with its walls, towers, and pleasure resorts, was indeed wonderful. In our own land cities, if not as ancient, yet fallen in more picturesque ruin, reward the labors of the explorer. Uxmal, Copan, and Palenque, invite our attention. Here are hieroglyphics in abundance, but no Rosetta Stone supplies the key by whose aid a Champollion can unravel the mystery. The luxuriant vegetative growth of the tropics, with its fierce storms, is every year hastening the obliteration of these ruins, and we must improve the time well, if we would learn from them what they have to say of the past.