“Don’t you remember?” she said. “Lulu was at her desk when we put our things away this morning. While we were eating that apple, she must have taken the book; and no sooner did you leave the room to look for it, than she asked permission to put some stuff in the wastepaper-basket. I noticed, from the blackboard, that she paused at your desk on her way back. She must certainly have returned it then.”

Yet what was to be done? The affair was entirely too complicated to take to Miss Horton, even if Ernie could have made up her mind to that course.

“No,” she returned to Mary’s suggestion. “I just won’t. I’m no tell-tale. I’d rather give up all thought of the prize, even if I have worked so hard for it. If Lulu Jennings can enjoy the books earned this way, she’s welcome to ’em!” And Ernie thrust the fatal blank-book into the very bottom of her school-satchel, and snapped to the catch with a click!

The next morning examinations began, with arithmetic first as usual. Every girl in the class surveyed her paper anxiously, in search of the famous problem. It was there,—the ninth,—one of the four which Ernie had neglected to prove. At first this was rather a disappointment; but, having given up all hope of winning the prize, Ernie quickly dismissed the matter and set quietly to work, merely determining to pass as creditably as she could.

The moments flew quickly by. Absorbed in her calculations, Ernie forgot all feeling of pique or disappointment; nor did she again think of Lulu Jennings till, having finished her paper, she passed it under final review, when something struck her eye!

She gave a little bounce in her seat, and caught her breath sharply. The answer obtained to the all-important problem was different to-day from that which she had written out before!

She remembered distinctly what that other answer was, and went hastily over the work before her to see where the mistake lay. But it was right. It proved! Figure by figure Ernie followed the intricate proposition, to which, without a doubt, she had at last obtained the correct solution! What had been wrong before she did not know, nor did she much care.

Instinctively her glance sought Lulu Jennings, who sat with head bent low above her desk. At the same moment Lulu raised her eyes. She did not look at Ernie, but cautiously toward Miss Horton, who was standing at the blackboard with her back toward the class. Lulu, seeing this, darted a stealthy hand into her desk, and brought out a little roll of paper which she placed in her lap, at the same moment throwing her handkerchief over it.

Ernie did not wait for anything further, but, rising from her seat, carried her paper to Miss Horton’s desk. No one paid any attention, as it is customary for the girls to put up their papers when finished. On her way back Ernie stopped beside Lulu just long enough to whisper,—

“I wouldn’t bother to copy that. It’s wrong.”