out from camp to hunt, alone, one day. I lost my way and later was captured by unfriendly natives. They took me farther into the interior to their village from which I finally escaped, but so utterly confused and lost that I had no idea what direction to take to find a trail to the coast. I wandered thus for months, until finally, upon an accursed day I found an entrance to this valley. I do not know why they did not put me to death at once, but they did not, and later they discovered that my knowledge could be turned to advantage to them. Since then I have helped them in their quarrying and mining and in their diamond cutting. I have given them iron drills with hardened points and drills tipped with diamonds. Now I am practically one of them, but always in my heart has been the hope that some day I might escape from the valley—a hopeless hope, though, I may assure you."
"There is no way out?" asked Tarzan.
"There is a way, but it is always guarded."
"Where is it?" queried Tarzan.
"It is a continuation of one of the mine tunnels, passing entirely through the mountain to the valley beyond. The mines have been worked by the ancestors of this race for an almost incalculable length of time. The mountains are honeycombed with their shafts and tunnels. Back of the gold-bearing quartz lies an enormous deposit of altered peridotite, which contains diamonds, in the search for which it evidently became necessary to extend
