rolled his eyes downward and scrutinized the ruined kang. He felt of his two ears that still reverberated with the enormous explosion. Then he spoke. "My son," said he, "it strikes me that we are on the verge of a great discovery. One of those medicines—though gracious knows which one—seems to be more than a medicine. It is good for something else—though dear knows what. Perhaps to grow wings, so that men may fly. It certainly enabled me to fly. We must make more medicines, and experiment."
The next day Dr. Chu Ping opened his book of instructions for the compounding of medicines—a book which he himself had written. Beginning at the very beginning—which, of course, was on the last page, good Dr. Chu studied the first formula. "Red pepper, and alum, and toad claws," so he read. The three ingredients were found and mixed in the specified proportions. The mixture was poured into a bamboo tube and the tube was placed in a fire. For an hour Dr. Chu Ping stirred the fire and fanned it into furious blazing. Nothing but much heat and much
