For a time Tarzan stood in statuesque silence, listening, hissensitive nostrils dilating as he assayed each passing breeze.Then he withdrew Werper into the concealment of thick brush, andwaited. Presently, along the game trail that Werper and Tarzan hadbeen following, there came in sight a sleek, yellow warrior, alertand watchful.

In single file way behind him, there followed, one after another, nearfifty others, each burdened with two dull-yellow ingots lashed uponhis back. Werper recognized the party immediately as that whichhad accompanied Tarzan on his journey to 0par. He glanced at theape-man; but in the savage, watchful eyes he saw no recognition ofBasuli and those other loyal Waziri.

When all had passed, Tarzan rose and emerged from concealment. Helooked down the trail in the direction the party had gone. Thenhe turned to Werper.

"We will follow and slay them," he exclaimed.

"Why?" asked the Belgian.

"They are yellow," explained Tarzan. "It was a yellow who killedKala. They are the enemies of the Manganis."