over a spring, where it never freezes very thick, and of course they went through. There ought to be a mark put up here to warn ice-boats and skaters to keep off."
"We'll put one up," said Sammy, and a few days later they did mark the danger spot in the ice. It had frozen over again, and could not have been noticed except for the red box which Sammy and his chums placed there. Thus further accidents were avoided.
As for Jed and his companions, prompt action saved them from anything worse than slight colds. They got home, took hot baths, drank plenty of hot lemonade and, in a day or so, were out again.
It appeared that the three larger boys had bought the iceboat at second-hand from a man in another town. It was the first time they had tried it that they sailed over the thin ice, and went in.
"But it won't happen again," said Jed to Sammy, when he and Jim and Hank again met the three chums. "Thanks to you chaps we'll know where the danger spot is now."
"And thanks to them that we're not down there under the ice now," added Hank, with a slight shiver.
"That's right," chimed in Jim. "Say, any time you boys want a ride in our ice-boat, let us know."
"Sure enough!" exclaimed Jed. "Maybe you fellows would like to take a sail. It's perfectly safe on the lake now, and we've fixed the boat where she was broken that day."
"Is the ice safe?" asked Sammy.
"Sure," answered Jim. "It's frozen ever so much thicker than it was the day we went out, and besides, we won't go near the danger spot. Don't you want to come for a trip?"
"Fellows, I've an idea!" cried Sammy, looking at his chums.
"What, another?" asked Bob.
