theory of evolution, Lucilla?"

His habit of ending a tense moment by making an irrelevant query no longer even startled her. Obediently, she fumbled for an answer. "Not much. Just that he thought all the different kinds of life on earth today evolved from a few blobs of protoplasm that sprouted wings or grew fur or developed teeth, depending on when they lived, and where." She paused hopefully, but met with only silence. "Sometimes what seemed like a step forward wasn't," she said, ransacking her brain for scattered bits of information. "Then the species died out, like the saber-tooth tiger, with those tusks that kept right on growing until they locked his jaws shut, so he starved to death." As she spoke, she remembered the huge beast as he had been pictured in one of her college textbooks. The recollection grew more and more vivid, until she could see both the picture and the facing page of text. There was an irregularly shaped inkblot in the upper corner and several heavily underlined sentences that stood out so distinctly she could actually read the words. "According to Darwin, variations in general are not infinitesimal, but in the nature of specific mutations. Thousands of these occur, but only the fittest survive the climate, the times, natural enemies, and their own kind, who strive to perpetuate themselves unchanged." Taken one by one, the words were all familiar—taken as a whole, they made no sense at all. She let the book slip unheeded from her mind and stared at Dr. Andrews in bewilderment.

"Try saying it in a different way."

"You sound like a school teacher humoring a stupid child." And then, because of the habit of obedience was strong, "I guess he meant that tails didn't grow an inch at a time, the way the dog's got cut off, but all at once ... like a fish being born with legs as well as fins, or a baby saber-tooth showing up among tigers with regular teeth, or one ape in a tribe discovering he could swing down out of the treetops and stand erect and walk alone."

He echoed her last words. "And walk alone...." A premonitory chill traced its icy way down Lucilla's backbone. For a second she stood on gray moss, under a gray sky, in the midst of a gray silence. "He not only could walk alone, he had to. Do you remember what your book said?"

"Only the fittest survive," Lucilla said numbly. "Because they have to fight the climate ... and their natural enemies ... and their own kind." She swung her feet to the floor and pushed herself into a sitting position. "I'm not a ... a mutation. I'm not, I'm not, I'm NOT, 

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