Incredulously he slapped each of his pockets, and went the round and slapped them all over again. He looked into his discarded military blouse; had a cheering idea about having seen cigarettes in a drawer; did not find them; and brazenly marched into the room where hung the aprons and jackets of the technicians. Furiously he pilfered pockets, and found a dozen beautiful cigarettes in a wrinkled and flattened paper case.

To test each of the four possible causes of the flask’s clearing he prepared and seeded with bacteria a series of flasks under varying conditions, and set them away in the incubator at body temperature. Till the last flask was put away, his hand was steady, his worn face calm. He was above all nervousness, free from all uncertainty, a professional going about his business.

By this time it was six o’clock of a fine wide August morning, and as he ceased his swift work, as taut nerves slackened, he looked out of his lofty window and was conscious of the world below: bright roofs, jubilant towers, and a high-decked Sound steamer swaggering up the glossy river.

He was completely fagged; he was, like a surgeon after a battle, like a reporter during an earthquake, perhaps a little insane; but sleepy he was not. He cursed the delay involved in the growth of the bacteria, without which he could not discover the effect of the various sorts of broths and bacterial strains, but choked his impatience.

He mounted the noisy slate stairway to the lofty world of the roof. He listened at the door of the Institute’s animal house. The guinea pigs, awake and nibbling, were making a sound like that of a wet cloth rubbed on glass in window-cleaning. He stamped his foot, and in fright they broke out in their strange sound of fear, like the cooing of doves.

He marched violently up and down, refreshed by the soaring sky, till he was calmed to hunger. Again he went pillaging. He found chocolate belonging to an innocent technician; he even invaded the office of the Director and in the desk of the Diana-like Pearl Robbins unearthed tea and a kettle (as well as a lip-stick, and a love-letter beginning “My Little Ickles”). He made himself a profoundly bad cup of tea, then, his whole body dragging, returned to his table to set down elaborately, in a shabby, nearly-filled note-book, every step of his experiment.

After seven he worked out the operation of the telephone switchboard and called the Lower Manhattan Hospital. Could Dr. Arrowsmith have some more pus from the same carbuncle? What? It’d healed? Curse it! No more of that material.

He hesitated over waiting for Gottlieb’s arrival, to tell him of the discovery, but determined to keep silence till he should have determined whether it was an accident. Eyes wide, too wrought up to sleep in the subway, he fled uptown to tell Leora. He had to tell some one! Waves of fear, doubt, certainty, and fear again swept over him; his ears rang and his hands trembled.

He rushed up to the flat; he bawled “Lee! Lee!” before he had unlocked the door. And she was gone.

He gaped. The flat breathed emptiness. He searched it again. She had slept there, she had had a cup of coffee, but she had vanished.