242 ELEMENTS OF GENERAL SCIENCE 



Few aspects of modern science have undergone more rapid 

 development in recent years than has electricity. It has come 

 to be a part of the daily life of almost every man and woman. 

 It opens many new opportunities for industrial, professional, 

 and inventive genius. It engages the casual attention of the 

 child at play, and provides baffling problems for the most 

 highly trained men. Although enormous development of elec- 

 trical industries has occurred, and although we use electricity 

 so constantly, our knowledge of the real nature of electricity 

 itself is prooably just in its infancy. 



