"What is it, dear?" asked Young again.

"I--I thought I saw it looking out, eyes that stared at us--"

The girl broke off, laughed shortly, and added, "I suppose it was Mr.

Leffler's talking. There's nothing there now."

"Probably the Manchurian devil shows itself only to you," said her father jokingly. "Well, be careful, dear. If it takes a notion to jump out at you, call me and I'll exorcise it for you."

Betty blushed and laughed again. She looked at Marable, expecting to see a smile of derision on the young man's face, but his expression was grave.

The light from above was diminishing; outside sounded the roar of home-going traffic.

"Well, we must go home," said Professor Young. "There's a hard and interesting day ahead of us to-morrow, and I want to read Orling's new work on matrices before we begin chipping at the amber."

Young turned on his heel and strode toward the locker at the end of the room where he kept his coat and hat. Betty, about to follow him, was aware of a hand on her arm, and she turned to find Marable staring at her.

"I saw them, too," he whispered. "Could it have been just imagination?

Was it some refraction of the light?"

The girl paled. "I--I don't know," she replied, in a low voice. "I thought I saw two terrible eyes glaring at me from the inky heart. But when father laughed at me, I was ashamed of myself and thought it was just my fancy."

"The center is liquid, I'm sure," said Marable. "We will find that out soon enough, when we get started."

"Anyway, you must be careful, and so must father," declared the girl.

She looked at the block again, as it towered there above them, as though she expected it to open and the monster of the coolies' imagination leap out.

"Come along, Betty," called her father.

She realized then that Marable was holding her hand. She pulled away and went to join her father.

It was slow work, chipping away the matrix. Only a bit at a time could be cut into, for they came upon many insects imbedded in the amber.

These small creatures proved intensely interesting to the paleontologists, for some were new to science and had to be carefully preserved for study later on.

Marable and her father labored all day. Betty, aiding them, was obviously nervous. She kept begging her father to take care, and finally, when he stopped work and asked her what ailed her, she could not tell him.

"Be careful," she said, again and again.

Her father realized that she was afraid of the amber block, and he poked fun at her ceaselessly. Marable said nothing.

"It's getting much softer, now the outside sh.e.l.l is pierced," said Young, late in the day.

"Yes," said Marable, pausing in his work of chipping away a portion of matrix. "Soon we will strike the heart, and then we will find out whether we are right about it being liquid. We must make some preparations for catching it, if it proves to be so."

The light was fading. Outside, it was cold, but the laboratories were well heated by steam. Close by where they worked was a radiator, so that they had been kept warm all day.

Most of the workers in the room were making ready to leave. Young and Marable, loath to leave such interesting material, put down their chisels last of all. Throughout the day various scientific visitors had interrupted them to inspect the immense amber block, and hear the history of it.

All day, Betty Young had stared fascinatedly at the inky center.

"I think it must have been imagination," she whispered to Marable, when Young had gone to don his coat and hat. "I saw nothing to-day."

"Nor did I," confessed Marable. "But I thought I heard dull sc.r.a.pings inside the block. My brain tells me I'm an imaginative fool, that nothing could be alive inside there, but just the same, I keep thinking about those eyes we thought we saw. It shows how far the imagination will take one."

"It's getting dark, Betty," said her father. "Better not stay here in the shadows or the devil will get you. I wonder if it will be Chinese or up-to-date American!"

The girl laughed, said good night to Marable, and followed her father from the laboratory. As they crossed the threshold a stout, red-faced man in a gray uniform, a watchman's clock hanging at his side, raised his hat and smiled at the young woman and her father.

"h.e.l.lo, Rooney," cried Betty.

"How d'ye do, Miss Young! Stayin' late this evenin'?"

"No, we're leaving now, Rooney. Good night."

"G' night, Miss Young. Sleep happy."

"Thanks, Rooney."

The old night watchman was a jolly fellow, and everybody liked him. He was very fond of Betty, and the young woman always pa.s.sed a pleasant word with him.

Rooney entered the room where the amber blocks were. The girl walked with her father down the long corridor. She heard Marable's step behind them.

"Wait for me a moment, father," she said.

She went back, smiling at Marable as she pa.s.sed him, and entered the door, but remained in the portal and called to Rooney, who was down the laboratory.

He came hurrying to her side at her nervous hail.

"What is it, ma'am?" asked Rooney.

"You'll be careful, won't you, Rooney?" she asked in a low voice.

"Oh, yes, ma'am. I'm always careful. n.o.body can get in to harm anything while Rooney's about."

"I don't mean that. I want you to be careful yourself, when you're in this room to-night."

"Why, miss, what is there to be wary of? Nothin' but some funny lookin'

stones, far as I can see."

The young woman was embarra.s.sed by her own impalpable fears, and she took leave of Rooney and rejoined her father, determined to overcome them and dismiss them from her mind.