He had said they might be a hundred thousand years in the past, or a million years--he didn't know which. The appearance of the lizard-birds, the great winged dragons of mythology, had seemed to prove that the scientist was correct.

Did these two mysterious planes, of strange shape and design and with the ability to fly at such blinding speed, prove that he was wrong?

Was it possible--the thought stunned Craig--that they had been precipitated into the future?

The winged dragons belonged to the past. The planes, theoretically at least, belonged to the future.

"Something is crazy!" Captain Higgins said. "Go get that scientist," he spoke to one of his aides. "I want to talk to him."

Michaelson came to the bridge and listened quietly to what Higgins had to say. His grave face registered no emotion but his eyes were grim.

"I can definitely tell you _two_ things," he said at last. "One of them is that we are not in what could be called the future."

"But those two planes were better than anything we have invented!"

Captain Higgins insisted. "The airplane was not invented until 1907.

This _has_ to be the future."

"_Men_ invented airplanes in 1907," Michaelson said. Ever so slightly he emphasized the word "_men_."

Higgins stared at him. Slowly, as he realized the implication of what the scientist had said, his face began to change. "What are you driving at?" he said, his voice a whisper.

Michaelson spread his hands in a helpless gesture. "The Wright brothers invented the lighter-than-air ship early in the twentieth century," he said. "They were the first men to fly a plane, the first men of our race. But how do we know what happened on earth a million years ago, and I can definitely tell you that we are at least a million years in the past? The history that we know fairly well does not cover a span of more than five thousand years. How can we be certain what happened or did not happen on earth millions of years ago?"

The scientist spoke quietly, his voice almost a whisper. "We are before the time of the airplane. Yet we find airplanes? What do you think that might mean?"

"I--" Higgins faltered, his mind flinching away from facing the unknown gulfs of time. He forced his mind to heel. "It means there are people here in this time," he said huskily. "People, or _something_, who know how to make planes."

Michaelson nodded. "That would be my conclusion," he said.

"But that is impossible," Higgins flared. "If there had been civilizations in the past, we would have a record of them. I mean, we would have found their cities, even if the people had disappeared. We would have found traces of their factories, of their buildings--"

"Would we?" Michaelson asked.

"Certainly. Don't you agree with me?"

"Not necessarily," the scientist said. "You are forgetting one important fact--the size of a million years. A million years from now will anyone be able to find New York? Chicago? London? The steel mills of Pittsburgh? I think not. In that length of time, the action of the rain, the frost, and the sun will have completely destroyed every sign that these places once existed. Besides, the continents we now know may have sunk and new ones appeared. How could we locate the ruin of Pittsburgh if the city were at the bottom of the Atlantic? A million years ago there may have been huge cities on earth. Man is not necessarily the first race ever to appear on the planet."

Craig, listening, recognized the logic in what Michaelson had said.

There might have been other races on earth! The vanity of men blinded them to that fact, when they thought about it at all. They wanted to believe they were the most important, and the only effort of creation, that the earth had come into being expressly for their benefit. Nature might have other plans.

Michaelson had suggested a logical solution for the dilemma of airplanes and flying dragons existing in the same world.

Craig saw the officers glancing uneasily in the direction from which the planes had come. Off yonder somewhere below the horizon was _something_.

They were worried about it. Against the beasts of this time, the Idaho was all-powerful. But how would the Idaho stack up against the _something_ that lay below the horizon? Or would the ship be able to escape back through the time fault before the threat of the mysterious planes became greater?

Out around the ship, small boats were planting charges of explosive. One boat was dashing out to the wrecked scouting plane to rescue the pilot.

"We have to see if we can get away from here, at once," Higgins said.

"We have to set off those explosives and see if they will force us back through the time fault."

They had to get away from this world. There was danger here. Planes that flew as fast as the one that had gone streaking off across the sky represented danger.

Higgins ordered the planting of the explosives to proceed at the double-quick.

"I said I could definitely tell you two things," Michaelson spoke again.

"One of them was that we are in the past, millions of years in the past." He spoke slowly, his eyes on the busy boats around the ship. "Are you not interested in the second of the two things I said I could tell you?"

"Yes," said Higgins. "What is it?"

The scientist sighed. "It is that we will never be able to return to our own time!"

"What? But--we are planting mines. If the explosion of the j.a.p bombs sent us through the time fault, maybe a second explosion will send us back through it."

Michaelson shook his head. "I have investigated the mathematics of it,"

he said. "It is impossible. You might as well call in your boats and save your explosives. The fact is, we are marooned in this time, _forever_!"

Marooned in time, forever! The words rang like bells of doom. Marooned forever. No chance of escape. No hope for escape.

"Are you sure?" Higgins questioned.

"Positive," the scientist answered.

Craig looked at the sea. He lit a cigarette, noting that it was the last one in the package. He drew the smoke into his lungs, feeling the bite of it.

Marooned in time, forever!

CHAPTER IV

Silver on the Sea

Night had come hours ago. Craig stood on the deck, watching the sea and the sky and the stars in the sky. Up overhead the constellations had changed. They were not the familiar star cl.u.s.ters that he knew.

Completely blacked out, the Idaho moved very slowly through the darkness. Her speed was kept to almost nothing because the charts of the navigators were useless. The charts had been made in that far future which the battle wagon had quitted forever and they revealed nothing about this sea. There might be a mile of water under the ship. She might be sc.r.a.ping bottom. The navigators were going mad worrying about what might be under the ship. Captain Higgins was going mad worrying not only about what might be under the ship but about what might soon be over it, when the mysterious planes returned. The pilot of the scouting plane had been rescued. He had not lived to tell what he had found.

Craig was aware of a shadow near him but he thought it was one of the crew until the match flared. It was Margy Sharp. She was lighting a cigarette.

A sharp reprimand from an officer caused her to drop the match.

"What's wrong?" she demanded. "Why can't I smoke?"

"Blackout," Craig said.

"Oh, it's _you_," the girl spoke.