the ramparts a million fighting-men are ever ready. The courts and gardens are filled with slaves, with women and with children. 

 “None could go a stone’s throw without detection.” 

 “If there is no other way, Thuvia, why dwell upon the difficulties of this. We must face them.” 

 “Can we not better make the attempt after dark?” asked Tars Tarkas. “There would seem to be no chance by day.” 

 “There would be a little better chance by night, but even then the ramparts are well guarded; possibly better than by day. There are fewer abroad in the courts and gardens, though,” said Thuvia. 

 “What is the hour?” I asked. 

 “It was midnight when you released me from my chains,” said Thuvia. “Two hours later we reached the storeroom. There you slept for fourteen hours. It must now be nearly sundown again. Come, we will go to some nearby window in the cliff and make sure.” 

 So saying, she led the way through winding corridors until at a sudden turn we came upon an opening which overlooked the Valley Dor. 

 At our right the sun was setting, a huge red orb, below the western range of Otz. A little below us stood the Holy Thern on watch upon his balcony. His scarlet robe of office was pulled tightly about him in anticipation of the cold that comes so suddenly with darkness as the sun sets. So rare is the atmosphere of Mars that it absorbs very little heat from the sun. During the daylight hours it is always extremely hot; at night it is intensely cold. Nor does the thin atmosphere refract the sun’s rays or diffuse its light as upon Earth. There is no twilight on Mars. When the great orb of day disappears beneath the horizon the effect is precisely as that of the extinguishing of a single lamp within a chamber. From brilliant light you are plunged without warning into utter darkness. Then the moons come; the mysterious, magic moons of Mars, hurtling like monster meteors low across the face of the planet. 

 The declining sun lighted brilliantly the eastern banks of Korus, the crimson sward, the gorgeous forest. Beneath the trees we saw feeding many herds of plant men. The adults stood aloft upon their toes and their mighty tails, their talons pruning every available leaf and twig. It was then that I understood the careful trimming of the trees which had led me to form the mistaken idea when first I opened my eyes upon the grove that it was the 

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