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all have been planned and controlled. Even as the Keeper of Earth drove out the human race, she might have been planning to replace our ancestors with new species. She might have been manipulating them both to help them both evolve intelligence."

"And in the meantime," said Zdorab, "to make them symbiotic so that they couldn't possibly survive without each other The old humans created the fiatworms and made it so that the angels' ancestors had to sculpt clay or they couldn't reproduce. Perhaps they didn't give any of the other captive animals a mechanism that would allow them to get a supply of the chemical they needed without human intervention. Only the diggers found their own way to piggyback on the angels' survival method. Who says the Keeper of Earth couldn't have put it all together that way? Perhaps it was because of the Keeper that humans first developed the flatworm vector for creating the chemical the angels needed. Perhaps the Keeper planned it all."

"Whatever the Keeper is," said Meb.

"I have another idea," said Elemak. "What if there's no such thing as the Keeper? Those dreams you had back on Harmony, you were all so sure they came from this supposed Keeper because the Oversoul knew nothing about the diggers and the angels. But now we find out that the Oversoul had all this information in his databanks, only he simply couldn't consciously access it. So those dreams could have come from the Oversoul all along, without his knowing it, right? And now we don't have to imagine some mechanism for sending dreams fester than light across the space between Earth and Harmony."

"Very good theory," said Shedemei. "But it doesn't explain Kiti making a perfect likeness of Nafai a hundred years before we arrived here."

"I don't think," said Volemak icily, "that it's very helpful to assume that just because we find the natural mechanism by which some things came to be, we have therefore proven that the Keeper of Earth does not exist. We don't know how far the reach of the Keeper might be, or what power he has; perhaps all he can do is give dreams to people. Wishful thinking gives false gods to people who hunger for gods, but those who yearn for a world with no gods are no less likely to fall victim to their own wishful thinking."

"I'll memorize that one, Father," said Meb. "That was deep."

Elemak smiled but did not speak.

"If we can set aside speculative theology," said Shedemei, "I want to lay two choices before you. The first choice is this: We can explain everything to the diggers and angels. The diggers can go back to using the sculptures. The angels can start trying to control their population by breeding less often-perhaps nothing more than each man making a sculpture only every other year. There's no reason to go back to the slaughter of infant angels. The trouble is that while this might work here, it will have no effect elsewhere. But perhaps that's the reason the Keeper of Earth brought us here, to teach the diggers and angels how to live together without killing."

"I thought we were setting aside speculative theology," said Meb.

"The other choice," said Shedemei, "is to get rid of that prophylactic gland."

"Get rid of it?" asked Volemak.

"I've found the gene that creates it. It's artificial-it was inserted. By analogy with the genes of unaltered rats and bats, we've found all the inserts and they're quite obvious. We isolated the particular genetic word that creates the prophylactic gland by inserting each of the artificial words into common rats and bats and seeing which ones developed the prophylactic gland. Knowing which gene causes it, we can uncause it."

"How?" asked Volemak.

"A bacterial infection that carries an enzyme whose sole function is to find that genetic word and clip it out. It's the method I use to do gene alteration anyway. I'll just use an infectious bacterium instead of the benign ones I usually work with. It has few symptoms. With the diggers it's a little stuffness of the joints and some nasal inflammation. With the angels it can also cause weeping eyes for a few days. Once the infection has spread throughout all digger and angel populations, reproduction will be cut loose from the flatworms. The angels can sculpt to their hearts' content, of course, but if they stop it won't matter. The change will only affect those conceived after the bacterial epidemic made the alteration in their parents, and it may