THE NERVOUS SYSTEM 183 



174.) We may perhaps preface our remarks by 

 saying that the strenuous life led by the individual 

 in the city, especially by the "hustler/' and espe- 

 cially by the "hustler" with a weak resistive ca- 

 pacity, may cause a nervous breakdown which is 

 not far removed from shell-shock. Again we must 

 refer the reader to Dr. Crile. 



Shell-shock 



I _ 



I I. I 



Transitory symptoms Concussions Psycho-neuroses 



Death Organic affection Functional affection 



I I I 



Hysteria Psychasthenia Neurasthenia 



Ductless glandular disturbance 



I I I 



Hyper-adrenalism Disfunction of sex glands Hyperthyroidism 



Shell-shock has been defined as "the condition 

 which follows exposure to the forces generated by 

 the explosion of powerful shells in the absence of 

 any visible injury to the head or spine." It may 

 result in a speedy recovery, in a definite concussion, 

 or in the appearance of symptoms of the psycho- 



