“Shall we take her with us when we go on our vacation, after school stops?” asked Bert of his mother, one morning.

“Perhaps,” she answered. “But you’d better hurry now, or you may be late for school.”

But, to tell the truth, Bert did not hurry very much. The days were getting more like summer all the while—warm and filled with sunshine—and perhaps this is the reason why Bert lingered on the way to school. But so did other boys and girls.

And perhaps this is the reason why Bert, in class that day, did not pay much attention to what was going on. It was the time for geography study, and the boys and girls had on their desks in front of them the large books, for they were learning to pick out places on the map of Africa.

Now the big geographies were large enough to hide behind, and perhaps you have done what many children have done at times—that is, you have read or written notes in the shadow of the covers of the big books held up in front of you.

Bert did not care about writing any notes, and he had none written by any other boy to read. But he had in his pocket a piece of tough, brown paper, and, almost before he knew it, Bert was folding this paper into what he called a “snap-cracker.”

As you boys and girls must know how to make them I will not take the time to tell you how it is done. But by folding his paper in a certain way, Bert at length had it in the shape of a triangle, with an inner fold that, when he brought the hand holding the paper down quickly and stopped it suddenly, would snap out with a pop like that of a bursting paper bag.

Bert made this snap-cracker and then he looked across the aisle. Danny Rugg sat there, and Danny was a mischievous fellow.

“I dare you to crack that!” whispered Danny to Bert.

“I will after school!” Bert whispered back. It was safe to whisper behind the big geographies.