University of Edinburgh Archive and Manuscript Collections

Scope and Contents Thomson discusses how intelligence is distributed between the various social or occupational levels of society. He explains the normal distribution of intelligence within the population, drawing parallels with the distribution of height. Thomson refers to inquiries carried out by him in Northumberland in 1922, and inquiries carried out in the Isle of Wight in 1924, which demonstrated that individual differences outweigh social differences, and supported the notion that heredity...