"I stuffed my toes with cotton," laughed another, "but even now they are hard to manage."

Just then a motor cycle shot past them, slowed down and stopped altogether.

The rider rested it against a tree and came back.

"I recognized you by your big feet," he said in a whisper. "Grace, here's the duplicate key to the laboratory. I had some trouble getting it, but no one knows, and you'll be safe enough. I'll let myself in with the other duplicate key and lock the door. They will be sure to try it at intervals. If you get into any trouble, early in the evening, make a dash for the steps and blow your horn loud. Now, that's all, I think.

I'll be hidden in the laboratory until my turn comes. Good-bye and good luck!"

In another instant he was off on his motor cycle.

Six figures, well disguised in dominoes of as many hues, presently appeared on the ball room floor, just in time for the grand march. It was a pity no one, except the lone teacher, was permitted to look at the brilliant picture. But such was the tradition of the cla.s.s. After the march, ten ballet girls in tarlatan skirts, their faces concealed by little black satin masks, gave a performance. Following this, a Spanish dancer, whom the six dominoes recognized at once as the treacherous Miriam Nesbit, gave an exhibition of her skill.

"I'm going to have some fun with her," whispered the blue domino to the red one. "Just follow me and see."

The last speaker joined the dancer as the music struck up a waltz.

"That was a good day's work you did for our cla.s.s, not long ago," she whispered as they danced off together.

"What do you mean?" asked the Spanish dancer.

"I mean the Black Monks of Asia. Now, do you understand?"

"But I thought it was not to be told," exclaimed the dancer, flushing under her mask.

"Only to the committee so that you might be rewarded with an invitation," whispered the domino, as she slipped away.

"_She_ did confess it, and every freshman in the cla.s.s shall know it to-morrow!" the emissary exclaimed privately to her friend, the red domino.

"In spite of what her brother is doing for us to-night?" returned the red domino.

"You are quite right, child. I never thought of that. Perhaps that is the very reason he is helping us get even to-night."

"I think it is," added the other, quietly.

"Girls, we must hurry up and begin," whispered another of the six dominoes. "They are all going to unmask at half-past ten."

So the unrecognized intruders slipped away, stationing themselves about the room.

Pretty soon a rumor began to spread among the dancers that there were young men present. No one knew exactly how it started, but it grew and spread with such persistency that it finally reached the ears of the chaperon.

"Some of the girls saw their feet," said her informant, "and not only their feet but their trousers, too."

The teacher rose and rapped sharply for order.

"Young ladies," she called in a loud voice, "I am sorry to disturb the dancers, but we have every reason to believe there are some men in the room. Since it is not yet time for you to unmask, it will be simple to find out who does not belong here by having you file past me. I will lift each mask myself."

The dancers accordingly arranged themselves in a long line and walked single file past the teacher. She saw only girl's faces, however, as she peeped under the masks, and the dance proceeded.

The next disturbance came when the maskers had all taken their stand at one end of the room at the request of the six dominoes, who managed to whisper to each soph.o.m.ore that there was presently to be a surprise.

An expectant hush fell over the company as the six dominoes filed out of a side room and stood, for a moment, in full view of the soph.o.m.ores.

Then the six deliberately lifted their dominoes, disclosing trouser legs and men's shoes. Instantly the place was in pandemonium; yet before the soph.o.m.ores could rush upon the intruders six long horns were blown in unison, and immediately the lights went out. In the darkness the six dominoes made for the stairs, rushed along the gallery, and were admitted to the laboratory by the duplicate key. But, just before the blue domino disappeared, she called out in a loud voice from the gallery:

"The freshmen are avenged!"

When the doors were safely closed the lights were turned on again, disclosing the soph.o.m.ores blinking foolishly at each other after the sudden startling change from darkness to light.

"They are in the laboratory!" cried one. "Let's cut off their escape!"

The angry soph.o.m.ores made a rush for the door.

"Hurry girls!" urged David, who had just returned to the laboratory after manipulating the lights. "They'll catch us before we know it."

But the young fugitives were too late. Just then there was the sound of many feet running up the stairs from the other door.

"How about one of the gallery doors?" asked Grace.

"They are all locked," answered David. "There only remain the skylight trap-door and the roof. Do you think you could manage it if I helped you?"

"Of course; we could manage anything," protested the freshmen girls.

It was an easy matter to climb up the ladder, and clamber through the trap-door on to the roof.

"We're just in time," whispered David. "They have found the right key to the gallery door, and they'll be coming in both ways. Crawl carefully now, girls, for heaven's sake, and don't slip!"

The seven young people began slowly to draw themselves along the gymnasium roof on their hands and knees. Fortunately, it was not a very sloping roof, and their only danger lay in their movements being heard from below. Meanwhile the gymnasium had emptied itself, and parties of enraged soph.o.m.ores were engaged in searching the adjoining cla.s.s rooms and pa.s.sages.

"Let's surround the building on the outside," cried one of the cla.s.s leaders. "They can't escape, then, by any of the fire escapes, and we are sure to catch them!"

In a few moments, David peeping over the edge of the roof, saw figures stationed at every possible exit, waiting patiently.

"Lie low," he whispered, "and crawl on your stomachs, or you're surely caught."

Soon after the seven had reached the end of the hundred feet of gymnasium, where their flight was stopped short by a blank wall where the gymnasium joined the High School building.

"Here's a pretty pa.s.s," whispered David. "I forgot about this old school wall. The only thing to do, now, is to hide behind this chimney and wait for the row to quiet down."

There they lay, as flat as possible, listening with bated breath to the soph.o.m.ores below. Presently there was a sound of footsteps on the gymnasium roof and they heard Miriam's voice saying:

"They must have escaped through the trap-door in the laboratory and come along here. Wait a minute, girls, and I'll see."

"O Grace, we're caught!" groaned Jessica. "What shall we do?"

"No we aren't yet," answered Grace. "Especially if she is coming alone, and that is what I am praying for."

"I'll come with you, Miriam," called the voice of the soph.o.m.ore leader.

"Why don't you take the other side?" proposed Miriam. "And I'll go around and meet you."