thought Jack, as he went on with his chemical tests.

He worked far into the night, and when he put out his light he said
to himself:

"I think I've got things just where I want them."




CHAPTER IV

A LESSON IN CHEMISTRY


Jack was awakened next morning by a knock on his door.

"Who's there?" he asked.

"Martin, the monitor," was the reply. "Dr, Mead wishes to see you at
once."

"Great Scott! I've overslept!" exclaimed Jack, as he jumped out of
bed and saw it was after eight o'clock. "No wonder, being up half the
night. Tell Dr. Mead I'm sorry and I'll be right down," he went on.

Jack almost made a record for dressing, and went to Dr. Mead's
office, where he found the same gathering that had confronted him the
previous morning.