86 THE ADVANCE OF SCIENCE 



for by the energy which is supplied to it. 

 The phenomena of consciousness which 

 arise, along with certain transformations 

 of energy, cannot be interpolated in the 

 series of these transformations, inasmuch 

 as they are not motions to which the doc- 

 trine of the conservation of energy ap- 

 plies. And, for the same reason, they do 

 not necessitate the using up of energy ; 

 a sensation has no mass and cannot be 

 conceived to be susceptible of movement. 

 That a particular molecular motion does 

 give rise to a state of consciousness is 

 experimentally certain ; but the how and 

 why of the process are just as inexpli- 

 cable as in the case of the communication 

 of kinetic energy by impact. 



When dealing with the doctrine of the 

 ultimate constitution of matter, we found 

 a certain resemblance betweeen the oldest 

 speculations and the newest doctrines of 

 physical philosophers. But there is no 

 such resemblance between the ancient and 



