fears he had thought buried forever had returned to plague him and he had developed a sudden, terrible dread of the fogginess outside the moving viewpane, the way the machine itself wheeled and dipped when an ancient ruin came sweeping toward him. He had developed a fear of Time.

There was no escape from that Time Fear. The instant it came upon him he lost all interest in historical research. 1069, 732, 2407, 1928—every date terrified him. The Black Plague in London, the Great Fire, the Spanish Armada in flames off the coast of a bleak little island that would soon mold the destiny of half the world—how meaningless it all seemed in the shadow of his fear!

Had the human race really advanced so much? Time had been conquered but no man was yet wise enough to heal himself if a stark, unreasoning fear took possession of his mind and heart, giving him no peace.

Moonson lowered his eyes, saw that Rutella was watching him in the manner of a shy woman not wishing to break in too abruptly on the thoughts of a stranger.

Deep within him he knew that he had become a stranger to his own wife and the realization sharply increased his torment. He stared down at her head against his knee, at her beautiful back and sleek, dark hair. Violet eyes she had, not black as they seemed at first glance but a deep, lustrous violet.

He remembered suddenly that he was still a young man, with a young man's ardor surging strong in him. He bent swiftly, kissed her lips and eyes. As he did so her arms tightened about him until he found himself wondering what he could have done to deserve such a woman.

She had never seemed more precious to him and for an instant he could feel his fear lessening a little. But it came back and was worse than before. It was like an old pain returning at an unexpected moment to chill a man with the sickening reminder that all joy must end.

His decision to act was made quickly.

The first step was the most difficult but with a deliberate effort of will he accomplished it to his satisfaction. His secret thoughts he buried beneath a continuous mental preoccupation with the vain and the trivial. It was important to the success of his plan that his companions should suspect nothing.

The second step was less difficult. The mental block remained firm and he succeeded in carrying on actual preparations for his departure in complete secrecy.

The third step was the final one and it took him from a large compartment to a small one, from a high-arching surface of metal to a maze of intricate control mechanisms in a space so narrow that he had to crouch to work with accuracy.

Swiftly and competently his fingers moved over instruments of science which only a completely sane man would have known how to manipulate. It was an acid test of his sanity and he knew as he worked that his reasoning faculties at least had suffered no impairment.

Beneath his hands the Time Observatory's controls were solid shafts of metal. But suddenly as he worked he found himself thinking of them as fluid abstractions, each a milestone in man's long progress from the jungle to the stars. Time and space—mass and velocity.

How incredible that it had taken centuries of patient technological research to master in a practical way the tremendous implications of Einstein's original postulate. Warp space with a rapidly moving object, move away from the observer with the speed of light—and the whole of human history assumed the firm contours of a landscape in space. Time and space merged and became one. And a man in an intricately-equipped Time Observatory could revisit the past as easily as he could travel across the great curve of the universe to the farthest planet of the farthest star.

The controls were suddenly firm in his hands. He knew precisely what adjustments to make. The iris of the human eye dilates and contracts with every shift of illumination, and the Time Observatory had an iris too. That iris could be opened without endangering his companions in the