“That—that’s all right, Johnny.”

“Say, Meggy!” Johnny exclaimed, “Do you suppose you could get your uncle to let us go down to see—see the ‘Prince’ and take Goggles along?”

“I’m sure I could, Johnny.”

“Tonight?”

“Maybe.”

“All right. You try, then phone me.”

At eight o’clock that evening three dark figures approached a door in the laboratories. Through the clouded glass of that door a pale light shone.

The smaller of the three, a boy, rapped three times. The door opened a crack. Shining eyes peered into the darkness. The door opened wider. The trio entered. Meggy, Johnny and Goggles found themselves being ushered into a dimly lighted room. The room was lined on all sides by test-tubes, beakers, retorts and all manner of instruments that belong to the fascinating and mysterious science of chemistry.

“You wanted to see me?” Something very like a smile played about the lips of the “Prince.”

“Yes,—er—it’s this.” Goggles drew two very small bottles from his pocket, then held them up to the light. Each vial contained a small quantity of some chemical substance.