" ' Thought,' in the most exalted sense of the word, 

 and certainly alive." Nature. 



Harper's Library of Living Thought 



Sir Oliver Lodge, F.R.S. 



THE ETHER OF SPACE 



Illustrated 



"This handy and fascinating volume 

 opens up new views into the nature of 

 the universe. Precise and lucid, it sum- 

 marizes our knowledge of the all-per- 

 vading substance which fills all space 

 and penetrates all matter the sub- 

 stratum of matter itself." 



Birmingham Post. 



" This work by the great physicist 

 will be found to possess an abiding 

 charm and an intellectual stimulation." 



Observer. 



"An admirable series in which intellectual prob- 

 lems of the time are dealt with by distinguished 

 writers." Truth. 



