The boys readily assumed charge of the specimens the professor had forgotten in his haste, but further questioning failed to bring out any information as to his whereabouts.

“He must have gotten some clue, or what he thought was a clue, to the location of the lizards,” observed Jerry, “and he started after them in his usual hurry. He’ll be back again soon. But I don’t like the idea of waiting for him. It will upset all our vacation plans.”

“Then why wait for him?” asked Bob.

“Oh, we don’t want to leave without him, after we half promised to take him with us.”

“No, I don’t mean that,” went on Ned. “But let’s trail him.”

“Trail him? How can we?” asked Ned. “We haven’t the least idea where he went.”

“No, but we might find out,” resumed the stout youth. “He would probably leave word at his home, near Boston, where he could be reached. He’d want his mail forwarded, too. You can be pretty sure that his housekeeper knows his address.

“Now what’s the matter with us starting our trip, and calling at his residence? We’re almost sure to get some information about him there. And you can bring along that specimen of yellow clay, Jerry.”

“Good idea, Bob! We’ll do it!” cried the tall lad.