A little later the bell rang. There was a murmur of voices in the hall, and Mr. Nestor, half listening, heard a voice he knew.

"There's Tom Swift now!" he exclaimed. "I'm going to find out why he doesn't enlist!"

Chapter V

"Is He a Slacker?"

Mr. Nestor, whatever else he was, proved to be a prudent father. He did not immediately go into the front room, whither Mary and Tom hastened, their voices mingling in talk and laughter.

Mr. Nestor, after leaving the young folks alone for a while, with a loud "Ahem!" and a rattling of his paper as he laid it aside, started for the parlor.

"Good-evening, Mr. Nestor!" said Tom, rising to shake hands with the father of his young and pretty hostess.

"Hello, Tom!" was the cordial greeting, in return. "What's going on up at your place?" went on Mr. Nestor, as he took a chair.

"Oh, nothing very special," Tom answered. "We're turning out different kinds of machines as usual, and dad and I are experimenting, also as usual."