RADIATION. 73 



it, a certain string will respond. Change the pitch of 

 your voice ; the first string ceases to vibrate, but another 

 replies. Change again the pitch ; the first two strings 

 are silent, while another resounds. Thus is sentient 

 man acted on by Nature, the optic, the auditory, and 

 other nerves of the human body being so many strings 

 differently tuned, and responsive to different forms of 

 the universal power. 



