father had been, when she had left her home at Anacortes, Washington, a well-to-do salmon fisherman. She had felt no fear of lack of money for further schooling. The two girls had therefore planned to study during this present year, Lucile at a great university situated near the shore of Lake Michigan and Marion in a renowned school of art in the same city.

But fortune plays rude tricks at times. They had returned to find that Lucile’s father’s fortune had been dissipated by an unfortunate investment in fish-traps for catching a run of sock-eyed salmon, a salmon run which failed, and that Marian’s father had grub-staked a “sure-winner” gold mine which had panned out not enough gold to pay for the miner’s “mucklucks” (skin-boots).

So Marian had given up the major portion of the money paid to her by the Ethnological Society for her sketches and Lucile had abandoned all hope of receiving money from her father for a university education. They had not, however, given up their plans for further schooling.

“Have to live carefully and not spend an extra cent,” had been Marian’s way of summing up the situation. “And we can make it all right. Why, just look at the price for rooms at the university.” She referred to a catalogue in her hand. “Twenty-three dollars a term. That is less than two dollars a week. We could pay that. Rooms outside the university certainly can’t be any more—probably not as much.”

Lucile smiled now as she recalled this bit of crude reasoning.

They had hurried on to the university with their little checking accounts. They had had—

But here again Lucile started and sprang half out of her berth. Came again that mysterious rat-tat-tat.

“What can it be?” she whispered. “Marian! Florence! Wake up. Someone is—”

These last words, uttered in a whisper, died on her lips. The other girls slept on. What was the use of waking them? Couldn’t be anything serious. And if it were, what could they do at this mad hour of night? Suppose they routed out old Timmie, keeper of the dry dock, what could he do? It was black as jet out there.

So she reasoned, and, having settled back between her blankets, began again the recalling of events.

They had arrived in the city by the lake to be completely disillusioned. All university rooms had been reserved for months ahead. So too had all outside rooms which might be had for a reasonable price. To pay the price demanded for such rooms as were available had been impossible. They faced the danger of being obliged to return to their homes, and this, to such girls as they were, was a calamity unthinkable.

Just at this critical moment, the O Moo had shown her masts above the horizon. She was a trim little pleasure yacht, thoroughly equipped for living on board. She belonged to a wealthy doctor named Holmes, a life-time friend of Lucile’s father.

“She’s in dry dock down about two miles from the university,” he had told the girls. “You’re welcome to live in her for the winter. Canvas over her now but you can prop that up here and there, I guess. Make a snug place to camp, I’d say. Cabin’s about ten by thirty and there’s everything you’d need, from an eggbeater to an electric range. There’s electric lights and everything; valve-in-the-head motor supplies ’em. Go on; live there if you want to; keep house and everything. Pretty stiff walk to the U. But there’s the lagoon in winter, with good skating a mile and a half of the way. What say—want to try it? Old Timmie, the keeper of the dry dock, will see that nobody bothers you. There’s some Chinamen living in a barge out there, some fishermen in a smack and a young chap in a gasoline schooner. Guess they are all peaceable folks, though. Might get another girl or two to go in with you. Plenty of room. We live on board her two months every summer, two families of us, six in all.”

If the girls had been captivated at once by this novel plan, once they had climbed aboard the yacht, they had been thrilled and delighted at the sight which met their eyes.

“She—she’s a regular little floating palace!” Lucile had stammered.

“Tut! Tut!” Mr. Holmes had remonstrated, “not quite a palace, though comfortable enough, and not floating at all, at the present moment.”

“It will be a cruise—the winter cruise of the O Moo,” Lucile had exclaimed in delight.

Had she but known how real these words would be to her some time hence—“The winter cruise of the O Moo”—she might have shuddered with fear and been sorely tempted not to accept her new home.

The power of divination was not one of her talents, so, with Marian at her side, she had proceeded to lift the heavy canvas which enshrouded the yacht’s deck, and, having crept ...

A truly wonderful cabin it was, all done in dark oak, with broad panels of green canvas along the walls, equipped with heavy oak tables and heavily over-stuffed chairs and lounges. It presented the appearance of a splendidly furnished but rather eccentric living room.

Here at one end the touch of a lever sent an electric range springing up from the floor. A second lever lowered a partition between this suddenly improvised kitchenette and the living room. Two cupboards to the right of this kitchen displayed dishes and cooking utensils. The opposite wall furnished a table which folded up when not in use. Behind this was a fully equipped kitchen cabinet.

“Convenient when in use, out of the way when not needed,” had been the doctor’s only comment.

This kitchen was forward. Aft were to be found four double berths. Modeled after the upper berths of a Pullman sleeper, these gave the maximum of comfort and when folded up occupied no space at all.

“It’s wonderful!” had been the most the girls could say. “And, oh! Doctor Holmes, we’ll pay you rent for it. You surely must allow us to do that,” Marian had exclaimed.

“Nonsense!” the good doctor had exclaimed. “Worked my way through school myself. Know what it means. All I ask is that you pass the good work on to some other fellow who needs a boost when you are through with school and making money.”

So here they were, and had been for two months, all comfortably established in the cabin of the O Moo.

Dr. Holmes had suggested that they might be able to accommodate another girl. They had become acquainted with Florence Huyler, a freshman in the physical culture department, and had decided at once that she was just the girl to join them.

Florence had not waited for a second invitation and here she was sleeping in the berth to Lucile’s right. Just why she should have seemed most fitting as a companion for such an adventure I can best tell you as events progress.

The long hike back and forth to the university and the art school had been a bit tiring at first, but in time they had come to enjoy it. Then winter had come and with it ice on the lagoon. Only yesterday they had had their first wonderful race over its shining surface. Her recollections came slower and slower and she was about to drift off into a dream when there came again that strange rat-tat-tat.

Once more she sat bolt upright to peer into the darkness; once more she asked herself the questions: “What can it be? Should I waken Marian and Florence?”

She did not waken them. To do so would seem, she thought, a trifle silly. The yacht stood upon a car with iron wheels which rested on a track raised five feet above the ground by a stout trestle work. The sides of the yacht