THE REALITIES OF SCIENCE 69 



sidering the phenomena of sound, are now seen to be 

 matter and energy. With these science is concerned 

 and about them we shall group our remaining dis- 

 cussion. They are the realities of mechanics and of 

 light, although in the latter case the medium is 

 not molecular and the vibrating bodies are electrons. 

 We shall find them the same for the other subdi- 

 visions of physics and for all physical science, including 

 chemistry. 



