Time folded back on itself. Once again, the hands of her wristwatch pointed to 4:30 and the white-clad receptionist said briskly, "Doctor will see you now." Once again, from some remote vantage point, Lucilla watched herself brush past Dr. Andrews and cross to the familiar couch, heard herself say, "It\'s getting worse," watched herself move through a flickering montage of scenes from childhood to womanhood, from past to present.

She opened he eyes to meet those of the man who sat patiently beside her. "You see," he said, "telling me wasn\'t so difficult, after all." And then, before she had decided on a response, "What do you know about Darwin\'s 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 le............