e was heritable, and these "Breeds" didn't have superior intelligence. According to Charles Spearman in his 1927 treatise, "An accurate measurement of everyone's intelligence would seem to herald the feasibility of selecting the better endowed persons for admissions into citizenship and even the right of having offspring." Dr. Cyril Burt studied fifty-three pairs of identical twins in order to prove the heritability of and fixed nature of intelligence. In Inventing Intelligence: Origins Of Mental Measurement by Peter Sacks, It states that in the Murray-Herrnstein book, The Bell Curve there was a basic message. The message was, inequality of class and race in America was simply the result of the natural order if things, arising from profound, heritable differences in the cognitive abilities of individuals. According to the Bell Curve, they also state that that cognitive ability is substantially heritable apparently no less than 40 percent and no more 80 percent. The characteristic that intelligence is fixed, is shared by the biological determinists. According to Herrnstein and Murray, IQ scores are stable over ones life. Therefore, when one takes an intelligence test at 5 years old that is what ones intelligence will be the rest of their life. The final Characteristic of biological determinists is intelligence is measurable. The Idea that intelligence was measurable began with the eugenics movement. According to Peter Sacks, Spearman believed that human intelligence was governed by a general ability passed on by generation to generation, as part of a natural selection if the fittest. He proved this by tested a group of children at a village school. The first real testing of intelligence began with Binet. His intention was to create a diagnostic tool to assess the developmental progress of children. However Terman had other plans with this test. When it was brought to America, in 1916, it was renamed the St...