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This, however, did not suit the ape-man, since Numa now suffered an occasional missile with no more than a snarl, while he settled himself to partake of his delayed feast. Tarzan scratched his head, pondering some more effective method of offense, for he had determined to prevent Numa from profiting in any way through his attack upon the tribe. The man-mind reasoned against the future, while the shaggy apes thought only of their present hatred of this ancestral enemy. Tarzan guessed that should Numa find it an easy thing to snatch a meal from the tribe of Kerchak, it would be but a short time before their existence would be one living nightmare of hideous watchfulness and dread. Numa must be taught that the killing of an ape brought immediate punishment and no rewards. It would take but a few lessons to insure the former safety of the tribe. This must be some old lion whose failing strength and agility had forced him to any prey that he could catch; but even a single lion, undisputed, could exterminate the tribe, or at least make its existence so precarious and so terrifying that life would no longer be a pleasant condition. During the brief respite while they were gathering their ammunition, Numa had settled himself to feed; but scarce had he arranged himself and his kill when a sharp piece of rock hurled by the practiced hand of the ape-man struck him upon the cheek. His sudden roar of pain and rage was smothered by a volley from the apes, who had seen Tarzan's act. Numa shook his massive head and glared upward at his tormentors. For a half hour they pursued him with rocks and broken branches, and though he dragged his kill into densest thickets, yet they always found a way to reach him with their missiles, giving him no opportunity to feed, and driving him on and on.