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 come here, for Horz is, perhaps, the oldest and the greatest of the dead cities of Barsoom. Water built it, the lack of water spelled its doom. I often wonder if the people of Earth, who have water in such abundance, really appreciate it.

I wonder if the inhabitants of New York City realize what it would mean to them if some enemy, establishing an air base within cruising radius of the first city of the New World, should successfully bomb and destroy Croton Dam and the Catskill water system. The railroads and the highways would be jammed with refugees, millions would die, and for years, perhaps forever, New York City would cease to be.

As I floated lazily above the deserted city I saw figures moving in a plaza below me. So Horz was not entirely deserted! My curiosity piqued, I dropped a little lower; and what I saw dashed thoughts of solitude from my mind-a lone red man beset by half a dozen fierce green warriors.