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THE NERVOUS SYSTEM OF MAN 
stimuli; or all stimuli which enter in the ear, seem to be 
sounds. The stimulus which passes over any of our special 
sense organs travels over several different nerve cells before 
it reaches the place in the brain where it is interpreted. The 
highly specialized nervous system and sense organs grow and 
are fed just as muscles or skin grow and are fed. There 
is no special food which we can eat that is used exclusively 
by the nervous system. 
QUESTIONS 
What is the nervous system ? Of what parts is it composed ? 
What animals have you studied that have a nervous system? Which 
ones lack a special nervous system? How does the nervous system 
grow? Describe the nerve cell. How does it differ from other cells 
in man? What are special senses? What kind of information do you 
receive through your eyes ? What kind through your ears ? Which do 
you remember? (The well-trained mind remembers equally well the 
information that comes in through each of his sense organs.) 
REFERENCES 
Cutten, The Psychology of Alcoholism. 
Davenport, Heredity in Relation to Eugenics. 
Guyer, Being Well-born. 
Horsley and Sturge, Alcoholism and the Human Body. 
