he tramped the streets, creaking with weariness, drinking too much coffee.
Every five minutes it came to him, as a quite new and ecstatic idea, "Why don't I go to sleep?" then remembered, and groaned, "No, I've got to keep going and watch every step. Can't leave it, or I'll have to begin all over again. But I'm so sleepy! Why don't I go to sleep?"
He dug down, before six, into a new layer of strength, and at six his examination showed that the flasks containing the original broth still had no growth of bacteria, and the flasks which he had seeded with the original pus had, like the first eccentric flask, after beginning to display a good growth of bacteria cleared up again under the slowly developing attack of the unknown assassin.
He sat down, drooping with relief. He had it! He stated in the conclusions of his first notes:
"I have observed a principle, which I shall temporarily call the X Principle, in pus from a staphylococcus infection, which checks the growth of several strains of staphylococcus, and which dissolves the staphylococci from the pus in question."
When he had finished, at seven, his head was on his notebook and he was asleep.
He awoke at ten, went home, ate like a savage, slept again, and was in the laboratory before dawn. His next rest was an hour that afternoon, sprawled on his laboratory table, with his garçon on guard; the next, a day and a half later, was eight hours in bed, from dawn till noon.
But in dreams he was constantly upsetting a rack of test-tubes or breaking a flask. He discovered an X Principle which dissolved chairs, tables, human beings. He went about smearing it on Bert Tozers and Dr. Bissexes and fiendishly watching them vanish, but accidentally he dropped it on Leora and saw her fading, and he woke screaming to find the real Leora's arms about him, while he sobbed, "Oh, I couldn't do anything without you! Don't ever leave me! I do love you so, even if this damned work does keep me tied up. Stay with me!"
While she sat by him on the frowsy bed, gay in her gingham, he went to sleep, to wake up three hours later and start off for the Institute, his eyes blood-glaring and set. She was ready for him with strong coffee, waiting on him silently, looking at him proudly, while he waved his arms, babbling:
"Gottlieb better not talk any more about the importance
