and then got out to look for a cave which Bert had heard was a short distance from shore. They did not find it at once, but while they were climbing up a little hill, thinking the cave might be somewhere near it, Harry was suddenly startled to receive a snowball on his ear.
"Ouch!" he cried. "Who threw that?"
They all stopped and looked around. No one was in sight.
"Maybe it fell off a tree," suggested Nan.
"It came too hard for that," declared Harry. "It was thrown."
They looked about again, but, seeing no one, went on. Then, suddenly there came another ball, and Dorothy cried:
"There, that came out of a tree, for I saw it. Right over there," and she pointed.
"Then if it came out of a tree someone is up the tree!" declared Bert, "and I'm going to see who it is."
As he rushed forward a snowball struck him full in the face.
