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 "Most positive, Professor," replied Mr. Philander, "and," he added, "I think we should thank the party. He may be sitting right next to you now, Professor."

"Eh? What's that? Tut, tut, Mr. Philander, tut, tut!" said Professor Porter, edging cautiously nearer to Mr. Philander.

Just then it occurred to Tarzan of the Apes that Numa had loitered beneath the tree for a sufficient length of time, so he raised his young head toward the heavens, and there rang out upon the terrified ears of the two old men the awful warning challenge of the anthropoid.

The two friends, huddled trembling in their precarious position on the limb, saw the great lion halt in his restless pacing as the blood-curdling cry smote his ears, and then slink quickly into the jungle, to be instantly lost to view.

"Even the lion trembles in fear," whispered Mr. Philander.

"Most remarkable, most remarkable," murmured Professor Porter, clutching frantically at Mr. Philander to regain the balance which the sudden fright had so perilously endangered. Unfortunately for them both, Mr. Philander's center of equilibrium was at that very moment hanging upon the ragged edge of nothing, so that it needed but the gentle impetus supplied by the additional weight of Professor Porter's body to topple the devoted secretary from the limb. [212]