DISTANCE CEPTORS EMOTIONS 145 



autonomic nervous system is capable, except that of 

 increasing the output of adrenin. 



That this physiologic response to injections of adrenin 

 is equivalent to the act of self-preservation by running 

 or fighting is made obvious by a detailed examination 

 of the significance of each phenomenon. The stimulated 

 organs and tissues are just the organs and tissues that 

 would be most utilized in a struggle for self-preserva- 

 tion by motor activity. The heightened activity of 

 the brain and special senses facilitates the speedier 

 perception of danger and preparation for it. The di- 

 lated pupil gives a larger range of vision ; the expanded 

 nostrils a freer intake of oxygen and faster elimination 

 of carbon dioxid to facilitate the increased transforma- 

 tion of energy and neutralization of acid by-products. 

 The activity of the sweat glands tends to regulate 

 the rising temperature. The increased activity of 

 the circulation provides the tissues more readily with 

 fuel and removes more rapidly the accumulation of 

 the waste products of activity. Finally, the energized 

 skeletal muscles consummate the whole adaptive re- 

 action of flight or attack, since it is through these 

 muscles that the teeth, the claws, and the limbs of 

 the moving organism are rendered effective in any 

 form of physical exertion. 



On the other hand, the inhibited organs and tissues 

 the organs of digestion and procreation are those 

 which would be of no assistance in a time of active 

 struggle. They are the non-combatants, so to speak, 

 as the other organs are the active artillery of the body 

 nation at war with environment. The digestive organs 

 ' are the kitchen and commissary department, the in- 



