smoke resulted. There was no noise and no flying. Clearly, the combination of pepper, alum, and toad claws was quite worthless—except in the treatment of scarlet fever, for which it is intended. The doctor made a careful writing of the experiment and turned another page.
Next came oyster shell and ginseng. Worthless that, also. Shark fins and turmeric. Dr. Chu Ping marked that likewise worthless. So the experimenting continued, day after day. It took a great deal of time. The doctor was a most thorough man, as well as brilliant. One couldn't find a more thorough or brilliant in all Kiang Su, or Kiang Si, or even in Kuang Si. Methodically he tried his medicines in the fire—by one and one he tried them—and thus he came to the mixture huo yao, which, to repeat, is sulphur, and saltpetre, and charcoal, and which the Fan Kwei, or Foreign Devils, with their white faces call Gun Powder. Dr. Chu Ping placed a long tube of huo yao in the fire. He leaned over it, fanning vigorously. For a moment the tube lay on the coals, sizzling and swelling,
