Early the following morning Tarzan set out again toward Opar, and directing his Waziri to continue the march in the most direct way, he left them that he might pursue further his investigations of the mysterious presence in his jungle that the arrow and the footsteps had apprised him of. Coming again to the spot at which darkness had forced him to abandon his investigations, he took up the spoor of the stranger. Nor had he followed it far before he came upon further evidence of the presence of this new and malign personality—stretched before him in the trail was the body of a giant ape, one of the tribe of great anthropoids among whom Tarzan had been raised. Protruding from the hairy abdomen of the Mangani was another of the machine-made arrows of civilization. The ape-man’s eyes narrowed and a scowl darkened his brow. Who was this who dared invade his sacred preserves and slaughter thus ruthlessly Tarzan’s people? A low growl rumbled in the throat of the ape-man. Sloughed with the habiliments of civilization was the thin veneer of civilization that Tarzan wore among white men. No English lord was this who looked upon the corpse of his hairy cousin, but another jungle beast in whose breast raged the unquenchable fire of suspicion and hatred for the man-thing that is the heritage of the jungle-bred. A beast of prey viewed the bloody work of ruthless man. Nor was there in the consciousness of Tarzan any acknowledgment of his blood relationship to the killer. Realizing that the trail had been made upon the second day before, Tarzan hastened on in pursuit of the slayer. There was no doubt in his mind but that plain murder had been committed, for he was sufficiently familiar with the traits of the Mangani to know that none of them would provoke assault unless driven to it. Tarzan was traveling up wind, and some half-hour after he had discovered the body of the ape his keen nostrils caught the scent spoor of others of its kind. Knowing the timidity of these fierce denizens of the jungle he moved forward now with great wariness, lest, warned of his approach, they take flight before they were aware of his identity. He did not see them often, yet he knew that there were always those among them who recalled him, and that through these he could always establish amicable relations with the balance of the tribe. Owing to the denseness of the undergrowth Tarzan chose the middle terraces for his advance, and here, swinging freely and swiftly among the leafy boughs, he came presently upon the giant anthropoids. There were about twenty of them in the band, and they were engaged, in a little natural clearing, in their never-ending search for caterpillars and beetles, which formed important items in the diet of the Mangani.