230 



MENTAL HYGIENE 



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which they can achieve success. 

 If a child is permitted to fail 

 term after term, he falls into 

 an attitude of mind which de- 

 stroys his confidence and he 

 makes only a half-hearted 

 effort to succeed. He gets the 

 habit of failing. The pupils 

 who reach high school are, to 

 a certain extent, a selected 

 group, because the dullest pupils 

 have become discouraged and 

 dropped out. Education re- 

 sults in the growth of experi- 

 ence or mental age, but not 

 native ability. 



Relation of intelligence to 

 vocations. Individuals who 

 rate low in the intelligence tests are not, necessarily, undesirable 

 members of society. There are relativelv few^ children so dull that 

 they cannot succeed in some line of w^ork. INIany failures and 

 much discontent are due to the fact that boys and girls sometimes 

 enter vocations that require too much or too little intelligence in 

 relation to their mentality. 



The leg muscle of a freshly killed frog is at- 

 tached to a lever. It is stimulated through the 

 nerve by means of a make and break electric 

 current. A tracing of the contractions is made 

 on a revolving drum. At first the contraction 

 is very decided and regular. Slowly the re- 

 sponse decreases until the muscle ceases to 

 react. Rest or washing the muscle will start 

 the response anew, but in a short time fatigue 

 again is apparent. 



Record made on a revolving drum by a stimulated frog's muscle. 



In an experiment conducted by J. K. Flanders and reported by 

 Terman, the intelligence of a group of employees of an express 

 company was tested. These people were employed to do work 

 that required about the same level of mental ability. It was 



