not turn back for he was unafraid, though had he known what lay in store for one he loved most in all the world he would have flown through the trees to her side and allowed the gold of Opar to remain forever hidden in its forgotten storehouse.
Behind him that morning another white man pondered something he had heard during the night and very nearly did he give up his project and turn back upon his trail. It was Werper, the murderer, who in the still of the night had heard far away upon the trail ahead of him a sound that had filled his cowardly soul with terror — a sound such as he never before had heard in all his life, nor dreamed that such a frightful thing could emanate from the lungs of a God-created creature. He had heard the victory cry of the bull ape as Tarzan had screamed it forth into the face of Goro, the moon, and he had trembled then and hidden his face; and now in the broad light of a new day he trembled again as he recalled it, and would have turned back from the nameless danger the echo of that frightful sound seemed to portend, had he not stood in even greater fear of Achmet Zek, his master.
