"Listen," he said. "I had it all deep in my memory; but until this moment I couldn't make connections with it and apply my knowledge to this case. Now I recall everything. Herr Weichardt, a Munich pathologist, some years ago made some experiments which showed that fatigue was an actual pathological condition. In other words, he proved it was a disease, by discovering the germ and inoculating living organisms with it. He took some animals,—pigs, if I recall aright,—made them work till they were almost dead of fatigue, then removed the tired muscles and extracted the serum from them. With this he inoculated other animals. He found that a small dose of his serum culture caused all the characteristic symptoms of fatigue in the patient and that a heavy dose produced even death."
"But how could this gang administer such a poison?"
"Through the manicure, whom they had engaged and paid, of course. All she had to do, after she had received the serum from the man you saw, was to dip her nail scissors into the solution, and then clip the cuticle so as to draw blood. The merest scratch would suffice, and no noticeable sore in the finger would be caused; but the toxic germs would permeate the veins and be distributed all over the body. It was the fact that she had cut Tulliver's finger that aroused my memory; then the story of the treadmill instantly suggested Weichardt's experiments. It was a devilishly subtle plot. You see, they didn't dare actually to poison him, or give him any easily recognized disease. All they needed was to put him out of business for a day or so at critical moments when they needed time to prepare their fight."
