Masterpieces of Science 



first important field of their development. The 

 professor's exposures were comparatively long 

 an average of fifteen minutes in easily penetrable 

 media-, and half an hour or more in photograph- 

 ing the bones of the hand. Concerning vacuum 

 tubes, he said that he preferred the Hittorf, 

 because it had the most perfect vacuum, the 

 highest degree of air exhaustion being the con- 

 summation most desirable. In answer to a 

 question, "What of the future ? " he said: 



"I am not a prophet, and I am opposed to 

 prophesying. I am pursuing my investigations, 

 and as fast as my results are verified I shall make 

 them public. " 



" Do you think the rays can be so modified as 

 to photograph the organs of the human body ? ' ' 



In answer he took up the photograph of the 

 box of weights. "Here are already modifica- 

 tions," he said, indicating the various degrees of 

 shadow produced by the aluminum, platinum, 

 and brass weights, the brass hinges, and even the 

 metallic stamped lettering on the cover of the 

 box, which was faintly perceptible. 



" But Professor Neusser has already announced 

 that the photographing of the various organs is 

 possible. " 



"We shall see what we shall see," he said. 

 "We have the start now; the development will 

 follow in time. " 



"You know the apparatus for introducing the 

 electric light into the stomach?" 



"Yes." 



104 



