oldest part of the city lies upon the edge of a vast plateau; the newer portions, and they are countless thousands of years old, are terraced downward into a great gulf, marking the hopeless pursuit of the receding sea upon the shores of which this rich and powerful city once stood. The last poor, mean structures of a dying race have either disappeared or are only mouldering ruins now; but the splendid structures of her prime remain at the edge of the plateau, mute but eloquent reminders of her vanished grandeur-enduring monuments to the white-skinned, fair-haired race which has vanished forever.

I am always interested in these deserted cities of ancient Mars. Little is known of their inhabitants, other than what can be gathered from the stories told by the carvings which ornament the exteriors of many of their public buildings and the few remaining murals which have withstood the ravages of time and the vandalism of the green hordes which have overrun many of them. The extremely low humidity has helped to preserve them, but more than all else was the permanency of their construction. These magnificent edifices were built not for years but for eternities. The secrets of their mortars, their cements, and their pigments have been lost for ages; and for countless ages more, long after the last life has disappeared from the face of Barsoom, their works will remain, hurtling through space forever upon a dead, cold planet with no eye to see, with no mind to appreciate. It is a sad thing to contemplate.

At last I was over Horz. I had for long promised myself that some day I should

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