“I hope not,” replied the professor. “Still, he had a narrow escape.”

“Did something bite him?” asked Jerry.

The professor pointed to a small red mark on Bob’s leg.

“He received an electric shock,” said the naturalist.

“An electric shock?” echoed Ned.

“Yes; from the electric battery fish, or stinging ray, as they are sometimes called. They can give a severe shock, causing death under some circumstances, it is said. But I guess it was a young one that stung Bob. They are a fish,” the professor went on to explain, “fitted by nature with a perfect electric battery. I wish I had caught one for a specimen.”

“I didn’t think of it at the time this one stung me or I would have caught it for you,” said Bob, suddenly opening his eyes.

“Oh, you’re better, are you?” asked Jerry.

“I’m all right,” replied Bob. “It was quite a jar at first.”