"I am sure I haven't the slightest idea of what the explanation can be," I replied. "You see the remains of harness on most of them, but no weapons. I am inclined to think that Pan Dan Chee is right in assuming that they were trying to escape, but whether from an epidemic of sickness or something else we may never know."

From our dizzy footing on that precarious trail we had an excellent view of the valley below. It was level and well watered and the monotony of the scarlet grass which grows on Mars where there is water, was broken by forests, the whole making an amazing sight for one familiar with this dying planet.

There are crops and trees and other vegetation along the canals; there are lawns and gardens in the cities where irrigation is available; but never have I seen a sight like this except in the Valley Dor at the South Pole, where lies the Lost Sea of Korus. For here there was not only a vast expanse of fertile valley but there were rivers and at least one lake which I could see in the distance; and then Llana called our attention to a city, gleaming white, with lofty towers.

"What a beautiful city," she said. "I wonder what sort of people live there?"

"Probably somebody who would love nothing better than to slit our throats," I said.

"We Orovars are not like that," said Pan Dan Chee, "we hate to kill people. Why do all the other races on Mars hate each other so?"

"I don't think that it is hate that makes them want to kill each other," I said. "It is that is has become a custom. Since the drying up of the seas ages ago, survival has become more and more difficult; and in all those ages they have become so accustomed to battling for existence that now it has become second nature to kill all aliens."

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