Continuity 53 



a corpuscular kind; but this depends on 

 the velocity of electrons, and therefore 

 again can only be generated by their accel- 

 eration. 



The theory is bound to have curious 

 consequences; and already it has con- 

 tributed to some of the uprooting and 

 uncertainty that I speak of. For, if it 

 be true, every material interaction will 

 be electrical, i. e., etherial; and hence 

 arises our difficulty. Every kind of 

 force is transmitted by the ether, and 

 hence, so long as all our apparatus is 

 travelling together at one and the same 

 pace, we have no chance of detecting the 

 motion. That is the strength of the 

 Principle of Relativity. The changes are 

 not zero, but they cancel each other out of 

 observation. 



Many forms of statement of the 

 famous Michelson-Morley experiment 

 are misleading. It is said to prove that 

 the time taken by light to go with the 

 ether-stream is the same as that taken 

 to go against or across it. It does not 

 show that. What it shows is that the 



