“We’re well rid of them,” murmured the professor, as he prepared to extract the arrow head from Jerry’s foot. “But I wish I could have stayed at that mound. It was filled with historical relics and treasures, I’m sure.”

With Ned steering the boat, which, after it had gotten well away from the hostile negroes was sent along at slow speed, the professor called to Bob to assist him in affording relief to Jerry. The scientist saw that he would have to cut the weapon from the lad’s flesh, as the barbs held it too firmly to allow it being removed in any other way.

“Can you stand some pain?” asked Mr. Snodgrass.

“Go ahead,” replied Jerry grimly.

“If I only had some chloroform,” went on the scientist, “I could give you a whiff of it, and it would numb your senses a little. But I haven’t any. I guess you’ll have to stand it, my boy. I’ll be as gentle as I can.”

The professor carried a small set of surgical instruments with him, for use in dissecting the animals and insects he collected. He now produced several shining knives, at the sight of which Jerry did not have the most cheerful feelings in the world. But he knew the arrow head must be removed.

Mr. Snodgrass cleansed the knives in some antiseptic liquid he had among his possessions, and then made ready to cut the weapon out.

“Keep the boat as steady as possible,” he called to Ned. “Bob, you hold Jerry’s foot. It will soon be out.”

Jerry had a dim remembrance that he had heard some one say that before. He recalled that it was a dentist. A faint feeling was overcoming him.

Suddenly Ned uttered a cry, and pointed ahead. The professor suspended his surgical preparations and looked up. So did Bob and Jerry. The latter was on the point of fainting.