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〃But the sun is not in sight。〃
〃No； it shows itself only in the middle of the day； and then but for a few minutes。 We must go now and search for food。 I will show you how to catch the eyeless fish in the black caverns over there。〃 And he led the American into the blackness behind them。 Every now and then； as they stumbled along； Johnston would look longingly back toward the faint pink light that shone above the high black wall。 But Branasko hastened on。
Presently they came to the edge of a black chasm and the American was filled with awe； for； from the seemingly fathomless depths； came a great roaring sound like that of a mighty wind and the air that came from it was hot； though pure and free from the odor of gas。
〃What is this？〃 he asked。
〃They are everywhere；〃 answered Branasko； 〃if it were not for their hot breathing the Land of the Changing Sun would be cold and damp。〃
〃Then the sun does not give out heat？〃
〃No。〃
〃It is cold？〃
〃I believe so； I have never thought much about it。〃
The American was mystified； but he did not question farther； for Branasko was carefully lowering himself into the hot gulf。
〃Follow me；〃 he said； 〃we must cross it to reach the caves。 I will guide you。 I have been over this way before。〃
〃But can we stand the heat？〃
〃Oh； yes； when we get used to it； it is invigorating。 I perspire in streams； but I feel better afterward。 Come on。〃
Branasko's head only was above the ground。 〃I am standing on a ledge；〃 he said。 〃Get down beside me。 Fear nothing。 It is solid； besides； what does it matter？ You can die but once； and it would really be better to fall down there into the internal fires than to starve slowly。〃
Johnston shuddered convulsively as he let himself down beside Branasko。 His foot dislodged a stone。 With a crash it fell upon a lower ledge and bounded off and went whizzing down into the depths。 Both men listened。 They heard the stone bounding from ledge to ledge till the sound was lost in the internal roaring。
〃It is mighty deep；〃 said Johnston。
〃Yes； but follow me； we cannot stop here； we must go along this ledge till we get to the point where the chasm is narrow enough to jump across。 I have done it。〃
〃The American held to his companion with one hand and the rock with the other； and they slowly made their way along the narrow ledge； pausing every now and then to rest。 At every step the path grew more perilous and narrower； and the cliff on their left rose higher and higher； till the reflected light of the sun had entirely disappeared。 At certain points the hot wind dashed upon them as furiously as the whirling mist in 〃The Cave of Winds〃 at Niagara Falls。 Once Johnston's foot slipped and he fell； but was drawn back to safety by the strong arm of the Alphian。
〃Be careful； hold to the cliff's face；〃 warned Branasko indifferently； and he moved onward as if nothing unusual had occurred。 Presently they reached a point where a narrow boulder jutted out over the chasm toward the opposite side； and Branasko cautiously crawled out upon it。 When he had got to its end； Johnston could not see him in the gloom； but his voice came to him out of the roaring of the chasm。
〃I can see the other side； and am going to jump。〃 An instant later； the American heard the clatter of the Alphian's shoes on the rock； and his grunt of satisfaction。 Then Branasko called out： 〃Come on； crawl out till you feel the end of the rock； and then you can see me。〃
In great trepidation the American slowly crawled out on the narrow rock。 Below him yawned the hot darkness； above hung that black ominous canopy of nothingness。 Slowly he advanced on hands and knees； every moment feeling the sharp rock growing narrower； till finally he reached the end。 He looked ahead。 He could but faintly see the ledge and Branasko's tall form silhouetted upon it。
〃See； this is where you have to alight；〃 cried the Alphian。 〃Jump； I will catch you！〃
〃I am afraid I shall topple over when I stand up；〃 replied the American。 〃The rock is narrow and my head is already swimming。 I fear I cannot reach you。 It is no use。〃
〃Tut； tut！〃 exclaimed Branasko。 〃Stand up quickly； and jump at once。 Don't stop to think about it。〃
Johnston obeyed。 He felt his feet firmly braced on the rock and he sprang toward the opposite ledge with all his might。 Branasko caught him。
〃Good；〃 he grunted。 〃There is another place； we must jump again。 It is further on。〃 Along this ledge they went for some distance； Branasko leading the way and holding the arm of the American。
〃Now here we are； the chasm is a little wider； but the ledge on the other side is broader。〃 As he spoke he released Johnston's arm and prepared to jump。 He filled his lungs two or three times。 But he seemed to hesitate。 〃Pshaw； watching you back there has made me nervous。 I never cared before。 If I should happen to fall； go back to where we met； it is safer there without a guide than here。〃
Without another word Branasko hurled himself forward。 Johnston held his breath in horror； for Branasko's foot had slipped as he jumped。 The Alphian had struck the opposite ledge； but not with his feet； as he intended。 He clutched it with his hands and hung there for a moment； struggling to get a foothold in the emptiness beneath him。
〃It's no use； I am falling； I can hold no longer！〃 And Johnston；… …too terrified to reply；heard the poor fellow's hands slipping from the rock； causing a quantity of loose stones to go rattling down below。 With a low cry Branasko fell。 An instant later Johnston heard him strike the ledge beneath； and heard him cry out in pain。 Then all was still except the echoes of Branasko's cry； which bounded and rebounded from side to side of the chasm； and grew fainter and fainter； till it was submerged in the roaring below。 Then there was a rattle of stones； and Branasko's voice sounded： 〃A narrow escape！〃 he said faintly。 〃I am on another ledge〃then after a slight pause； 〃it is much wider； I don't know how wide。 Are you listening？〃
〃Yes； but are you hurt？〃
〃Not at all。 Simply knocked the breath out of me for a moment。 There is a cave behind me； and （for a moment there was silence） I can see a light ahead in the cave。 I think it must be the reflection of the internal fire。 Come down to me and we will explore the cavern； and see where the light comes from。〃
〃I can't get down there！〃 shouted Johnston； to make himself heard above a sudden increase in the roaring in the chasm； 〃there is no way。〃
〃Wait a moment！〃 came from the Alphian。 〃This ledge seems to incline upward。〃
Johnston stood perfectly motionless； afraid to move from the ledge either to right or to left； and heard Branasko's footsteps along the rock beneath。 〃All right so far；〃 he called up； and his voice showed that he had gone to a considerable distance to the left； 〃the ledge seems to be still leading gradually upward。 I think I can reach you。〃
Fifteen minutes passed。 The lone American could no longer hear Branasko's footsteps。 Johnston was becoming uneasy and the hot air was causing his head to swim。 He was thinking of trying to retrace his footsteps to a place of more security when he heard footsteps； and then the cheery voice of Branasko nearly opposite him acros