For, a few days later when Pasteur left the laboratory to go to some meeting or other, Roux took a healthy dog, put him easily out of pain with a little chloroform, and bored a hole in the beast’s head and exposed his palpitating, living brain. Then up into a syringe he drew a little bit of the ground-up brain of a dog just dead with rabies: “This stuff must be swarming with those rabies microbes that are maybe too small for us to see,” he pondered; and through the hole in the sleeping dog’s skull went the needle of the syringe, and into the living brain Roux slowly, gently shot the deadly rabid stuff.... Next morning Roux told Pasteur about it----“What!” shouted Pasteur. “Where is the poor creature ... he must be dying ... paralyzed....” But Roux was already down the stairs, and in an instant he was back, his operated dog prancing in ahead of him, jumping gayly against Pasteur, sniffing ’round among the old broth bottles under the laboratory benches. Then Pasteur realized Roux’s cleverness--and the new road of experiment that lay before him, and though he was not fond of dogs, his joy made him fuss over this one: “Good dog, excellent beast!” Pasteur said, and dreamed: “This beast will show that my idea will work....” Sure enough, less than two weeks later the good creature began to howl mournful cries and tear up his bed and gnaw at his cage--and in a few days more he was dead, and this brute died, as you will see, so that thousands of mankind might live. Now Pasteur and Roux and Chamberland had a sure way, that worked one hundred times out of one hundred, of giving rabies to their dogs and guinea-pigs and rabbits. “We cannot find the microbe--surely it must be too tiny for the strongest microscope to show us--there’s no way to grow it in flasks of soup ... but we can keep it alive--this deadly virus--in the brains of rabbits ... that is the only way to grow it,” you can hear Pasteur telling Roux and Chamberland. Never was there a more fantastic experiment in all of microbe hunting, or in any science, for that matter; never was there a more unscientific feat of science than this struggling, by Pasteur and his boys, with a microbe they couldn’t see--a weird bug of whose existence they only knew by its invisible growth in the living brains and spinal cords of an endless succession of rabbits and guinea-pigs and dogs. Their only knowledge that there was such a thing as the microbe of rabies was the convulsive death of the rabbits they injected, and the fearful cries of their trephined dogs....