EVOLUTION THE MASTER-KEY 



explanation. Indeed, scientific psychology as 

 distinguished from the academic verbiage some- 

 times indicated by that term is less concerned 

 to explain the facts of multiple personality than to 

 explain the opposite fact of the unity of conscious- 

 ness, which those who have never thought about 

 it would regard as needless of explanation. For 

 if the human mind be a composite structure, 

 built out of innumerable units of various deriva- 

 tion, how are we to explain the fact that the 

 thousands of millions of nerve-cells in the cortex, 

 or gray matter, of the brain do commonly act and 

 speak with one voice? For myself, I believe that 

 the key to this the really remarkable fact is 

 to be found in Professor Sherrington's researches 

 on reflex action, which fall to be discussed when 

 we consider the human will. 



Then, as regards subconsciousness the "buried 

 temple," as M. Maeterlinck calls it. We have 

 lately learned that mind and consciousness are by 

 no means synonymous terms. Consciousness, in- 

 deed, is to be regarded as the efflorescence of mind, 

 which is a far more extensive and fundamental 

 fact. During sleep consciousness is non-existent; 

 but mind is by no means so. The existence of 

 the mind is as continuous as is that of its organ, 

 the brain. The musician or poet has often com- 

 posed musical phrases or verses during the period 

 of unconsciousness or sleep, and has risen in the 

 night to record them to his utter surprise in the 

 morning. You are at your wits' ends to remember 

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