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energies supplied by carbonaceous material, and 

 this sudden accession of sugar in the blood supplies 

 the muscles with a much-needed food. " In the 

 agony of pain almost every muscle of the body 

 is brought into strong reaction/' as Darwin wrote, 

 and there is a considerable amount of evidence 

 that the increase of sugar in the blood does, as 

 Cannon says, in fact directly increase the muscular 

 efficiency. Thus one of the effects of the secre- 

 tion of adrenalin would be of direct benefit to 

 an organism in a rage wishing to exercise stern 

 muscular effort involving flight, conflict, or a 

 struggle to be free. 



Then, again, as Cannon points out, there is 

 evidence that an increased secretion of adrenalin 

 restore! the irritability of fatigued muscle. The 

 removal of the adrenal glands has a weakening 

 effect on muscular power, and the injection of 

 adrenalin has an invigorating effect. So that 

 not only does adrenalin bring out sugar from the 

 liver-stock to feed the muscles, but it also has a 

 remarkable influence in restoring fatigued muscles, 

 and thus the secretion set free in pain or fear or 

 rage puts the muscles of the body at the disposal 

 of the nervous system, and any difficulty which 

 the nerve impulses might have had in calling the 



