at his fingertips. The big room was a jungle of sealed glass cases where beady-eyed mice tumbled over each other, where healthy rabbits nibbled lettuce cheek by jowl with rabbits whose bodies seethed with mutant microbes. At the most crowded end of the room was Novik, brightest of the skilled young men assigned as assistants and apprentices to the great Dr. Euge, busy now with pencil and notebook, counting dead mice.

Euge looked over Novik's shoulder at the tallies. They were many. He asked, "What does it come to?"

"So far," said Novik, "I've only been over the direct and remote cages. But—" he gestured at the remaining glass compartments on his right, "I'd be willing to bet the results of the delayed exposures are the same. Contagion, one hundred per cent; mortality, one hundred per cent. The only difference is, that where infected and healthy mice have a screen between them, the healthy ones get it slower—a few cases at first, then it runs right through them."

"Mmm," said Euge without enthusiasm. The figures proved nothing new—only that the mutant virus bred true; for that matter, the 100-100 ratio of infections and deaths to exposures had been achieved already with RM3.

Euge turned toward a double tier of cages along the side wall. These were small, built to contain one animal apiece, ten above, ten below. They were segregation cages; the lower tier was wired to a wall plug through a transformer and a mildly remarkable device, consisting of two slowly revolving, eccentric wheels and a relay, which insured that the metal floor of the ten cages should be slightly electrified at irregular intervals.

"Mmm," said Euge again, surveying the victims of his unorthodox experiment. Of the ten mice in the bottom cages, not all were dead; they had been exposed to Virus RM4 somewhat later than those in the large cases, after the first tests on human beings; but those that still lived were obviously breathing their last. In the upper tier, though, seven mice were still bright-eyed and alert; two were dead, and a third lay on its side, panting and bedraggled.

Euge swung back to Novik. "Set up fifty more segregation cages. Clear the wired set for a repeat test. And get me half a dozen cats. And—" he hesitated, "don't mention these experiments to the others if you can help it; we two can handle all the necessary work."

Novik's clear eyes dwelt briefly on his superior's face, a look of sympathetic understanding for the haggard 

 Prev. P 5/19 next