“How did the snow house come to cave in?” questioned Jack, after the excitement had somewhat subsided.

“I give it up,” answered Andy. “The roof came down on us without warning.”

“Some fellows climbed up on the snow house,” put in Bart Conners.

“Climbed up on it?” queried Jack.

“Yes, three fellows. I saw it go down with them. Then the three fellows ran away as fast as they could go.”

“Who were those three fellows?” questioned Andy.

“I can’t tell you. I had been down to the lake looking to see if there was any clear ice for skating. I was too far off to recognize them.”

“Humph! that explains it,” murmured the young major. “The snow house was caved in on purpose.”

“I’d like to know who would be so mean!” exclaimed Andy. “Those chaps must have known that we were inside.”

“Perhaps they didn’t think it would be anything serious,” came from Stuffer, who was near. “Maybe they got scared after it went down, and then they ran away.”