RADIATION. 73 



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. 



