I saw no signs of extreme age among them, nor is there any appreciable difference in their appearance from the age of maturity, about forty, until, at about the age of one thousand years, they go voluntarily upon their last strange pilgrimage down the river Iss, which leads no living Martian knows whither and from whose bosom no Martian has ever returned, or would be allowed to live did he return after once embarking upon its cold, dark waters. 

 Only about one Martian in a thousand dies of sickness or disease, and possibly about twenty take the voluntary pilgrimage. The other nine hundred and seventy-nine die violent deaths in duels, in hunting, in aviation and in war; but perhaps by far the greatest death loss comes during the age of childhood, when vast numbers of the little Martians fall victims to the great white apes of Mars. 

 The average life expectancy of a Martian after the age of maturity is about three hundred years, but would be nearer the one-thousand mark were it not for the various means leading to violent death. Owing to the waning resources of the planet it evidently became necessary to counteract the increasing longevity which their remarkable skill in therapeutics and surgery produced, and so human life has come to be considered but lightly on Mars, as is evidenced by their dangerous sports and the almost continual warfare between the various communities. 

 There are other and natural causes tending toward a diminution of population, but nothing contributes so greatly to this end as the fact that no male or female Martian is ever voluntarily without a weapon of destruction. 

 As we neared the plaza and my presence was discovered we were immediately surrounded by hundreds of the creatures who seemed anxious to pluck me from my seat behind my guard. A word from the leader of the party stilled their clamor, and we proceeded at a trot across the plaza to the entrance of as magnificent an edifice as mortal eye has rested upon. 

 The building was low, but covered an enormous area. It was constructed of gleaming white marble inlaid with gold and brilliant stones which sparkled and scintillated in the sunlight. The main entrance was some hundred feet in width and projected from the building proper to form a huge canopy above the entrance hall. There was no stairway, but a gentle incline to the first floor of the building opened into an enormous chamber encircled by galleries. 

 On the floor of this chamber, which was dotted with highly carved wooden 

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