208 



evolution: the ages and tomorrow 



the ability of all the individuals of a society was no higher 

 than the highest in this average group (I.Q. 109) only a 

 limited, sparsely scattered, mediaeval economy would be 

 possible. 



Prepared from data in L. M. Terman and M. A. Merril, Measuring 

 Intelligejice (Boston: Houghton Mifflin Co., 1937) and from the classi- 

 fication of general ability in C. L. Pressey and Francis Robinson, Psychol- 

 ogy and The Neiv Education (New York: Harper & Bros., 1944), p. 89. 



The fundamental discovery and design of our present- 

 day science and utilities was the work of some of the more 

 favored individuals in the highest intelligence level, I.Q. 

 155 and up. In 1952 there were about 30,600 people in the 

 United States (only two-hundredths of one per cent of the 

 total population) who had potentially this sort of ability. 

 I say potentially because it will be only the very favored 

 individual (favored as to a multiplicity of environmental 

 factors) who will be able to deliver the expectation of this 

 high-level intelligence. Our present highly technical civiliza- 

 tion has been created by such individuals, and it cannot 



