The theory behind primate experimentation was that these animals were closer biologically to man. In the 1950's, several laboratories even attempted experiments on gorillas, going to great trouble and expense to work with these seemingly most human of animals. However, by 1960 it had been demonstrated that of the apes, the chimpanzee was biochemically more like man than the gorilla. (On the basis of similarity to man, the choice of laboratory animals is often surprising. For example, the hamster is preferred for immunological and cancer studies, since his responses are so similar to man's, while for studies of the heart and circulation, the pig is considered most like man.)

Stone put his hands back on the controls, moving them gently. Through the glass, they saw the black metal fingers move to the far wall of the adjoining room, where several caged lab animals were kept, separated from the room by hinged airtight doors. The wall reminded Hall oddly of an automat.

The mechanical hands opened one door and removed a rat in its cage, brought it into the room, and set it down next to the capsule. The rat looked around the room, sniffed the air, and made some stretching movements with its neck. A moment later it flopped over onto its side, kicked once, and was still.

It had happened with astonishing speed. Hall could hardly believe it had happened at all.

"My God," Stone said. "What a time course."

"That will make it difficult," Leavitt said.

Burton said, "We can try tracers . . ."

"Yes. We'll have to use tracers on it," Stone said. "How fast are our scans?"

"Milliseconds, if necessary."

"It will be necessary."

"Try the rhesus," Burton said. "You'll want a post on it, anyway."

Stone directed the mechanical hands back to the wall, opening another door and withdrawing a cage containing a large brown adult rhesus monkey. The monkey screeched as it was lifted and banged against the bars of its cage.

Then it died, after flinging one hand to its chest with a look of startled surprise.

Stone shook his head. "Well, at least we know it's still biologically active. Whatever killed everyone in Piedmont is still there, and still as potent as ever." He sighed. "If potent is the word."

Leavitt said, "We'd better start a scan of the capsule."

"I'll take these dead animals," Burton said, "and run the initial vector studies. Then I'll autopsy them."

Stone worked the mechanical hands once more. He picked up the cages that held the rat and monkey and set them on a rubber conveyor belt at the rear of the room. Then he pressed a button on a control console marked AUTOPSY. The conveyor belt began to move.

Burton left the room, walking down the corridor to the autopsy room, knowing that the conveyor belt, made to carry materials from one lab to another, would have automatically delivered the cages.

Stone said to Hall, "You're the practicing physician among us. I'm afraid you've got a rather tough job right now."