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194 poured into the tube it seemed to change colour. Then Signor Davelli handed the tube to the man who had come in answer to his call, and this man, who appeared to know exactly what was expected of him, took the tube and blew through it upon the germ. I could not see that anything came through the tube, but in a few seconds a kind of cream-coloured spray began to rise from the germ, and Signor Davelli observed this, not the germ but the spray, very carefully through the magnifier. He seemed highly pleased; he selected a few more germs which he said were of the same sort as this; he spoke of them as particularly "promising," and he indicated, as I thought (for just here he began to speak in a tongue unknown to me), the treatment which in his judgment they ought to receive.

When I could no longer understand him I looked again to the workers at the beds. There were now a great many more workers at the first bed, and the work all through was proceeding in a very rapid and orderly manner. I followed quickly the whole process from first to last: the gathering in of the germs, their preliminary examination, the treatment which they underwent on the platform, the tests to which they were subjected before and after that treatment, their