organism was incapable of standing the rigors of acceleration. Women had had laws passed, and if the women caught him doing this, the punishment would be extreme for him, personally, and a lot more extreme for Earth civilization in general. If you could call it a civilization. You could call it anything, Bowren groaned—but it didn't make sense. A world without women. A birthrate reduced to zero.

A trickle of sweat slid past Bowren's eyes, loosening a nervous flush along his back that prickled painfully. His throat was tense and his heart pounded loud in the hot dark.

A sharp pain ran up his body and exploded in his head. He tried to swallow, but something gagged in his throat. He was afraid of retching. He lay with his mouth open, spittle dribbling over his lips. The pain returned, hammered at his entrails. He fought the pain numbly, like a man grappling in the dark.

The wave subsided and he lay there gasping, his fists clenched.

"The pain will come in increasingly powerful waves," the Doctor had said. "At a certain point, it will be so great, the analytical mind will completely short-circuit. It will stay that way enroute to Mars, and meanwhile your body will rapidly change into that of a beast. Don't worry about it. A catalytic agent will return you to normal before you reach the planet. If you live, you'll be human again."

A male human couldn't stand the acceleration. But a woman could. Animals could. They had experimented on human males and animals in the giant centrifuges, and learned what to do. Animals could stand 25 "G" consistently, or centrifugal forces as high as 120 revolutions a minute. About 10 "G" was the limit of female endurance. Less for men.

It had never been thoroughly determined why women had been able to stand higher acceleration. But human females had the same physical advantages over men as female rats, rabbits, and cats over males of the same species. A woman's cellular structure was different; her center of gravity was different, the brain waves given off during acceleration were different. It was suspected that the autonomic nervous system in women could function more freely to protect the body during emergency situations. The only certainty about it was that no man had ever been able to get into space and live.

But animals could so they had worked on it and finally they decided to change a man into an animal, at least temporarily. Geneticists and biochemists and other specialists had been able 

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