ADAMS— THE EINSTEIN THEORY. 183 



give us a representation of natural phenomena ; but according to 

 Einstein the materials we have hitherto used to form such models — 

 our conceptions of space, time and matter — are inadequate. If his 

 theory is to stand we must make a new universe in our minds, a 

 universe in which space and time have an existence only when con- 

 sidered in their relation to matter. 



