AS THE BIOLOGIST SEES IT 



of ingenious intelligence tests, with point 

 scales, by which a definite rating for 

 intelligence can be determined for any 

 individual. These tests were first devised 

 for children but modifications of them 

 have been used for adults. An extensive 

 use of these tests, with highly successful 

 results, was made during the war for 

 rating American soldiers and officers. 

 Indeed the success of this method of 

 testing and expressing intelligence has 

 been one of the most brilliant and useful 

 modern contributions of psychology to 

 practical life. 



An interesting and useful feature in 

 connection with the tests is the expression 

 of their results in terms of mental age 

 which may be contrasted at once with the 

 actual age of the individuals tested, so 

 that the degree of mental retardation or 

 advancement is made manifest in readily 

 understandable terms. Thus a child of 

 12 years of age may be found to have a 

 mental age of but 8 years, meaning that 

 the intelligence of this 12 year old child 

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