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 been men and lions to the right and left of them, and men and lions in front and behind. The ape-man was puzzled by the possibilities suggested by the tracks, but in the light of any previous experience he could not explain satisfactorily to himself what his perceptions indicated.

There was little change in the formation of the gorge; it still wound its erratic course between precipitous cliffs. In places it widened out and again it became very narrow and always deeper the farther south they traveled. Presently the bottom of the gorge began to slope more rapidly. Here and there were indications of ancient rapids and waterfalls. The trail became more difficult but was well marked and showed indications of great antiquity, and, in places, the handiwork of man. They had proceeded for a half or three-quarters of a mile when, at a turning of the gorge, Tarzan saw before him a narrow valley cut deep into the living rock of the earth's crust with lofty mountain ranges bounding it upon the south. How far it extended east and west he could not see, but apparently it was no more than three or four miles across from north to south.

That it was a well-watered valley was indicated by the wealth of vegetation that carpeted its floor from the rocky cliffs upon the north to the mountains on the south.

Over the edge of the cliffs from which the ape-man viewed the valley a trail had been hewn that led downward to the base. Preceded by the lion Tarzan