Graziano & Raulin
Research Methods (9th edition)
Francis Galton (1822-1911) was an English scientist. Galton is said to have had a prodigious intellect, with an estimated IQ of 200, and was interested in a wide range of phenomena.
When Darwin, who was Galton’s cousin, published On the Origin of Species Through Natural Selection (1859), Galton became interested in the concepts of evolution as they might apply to mental inheritance, and he began to study intelligence and the measurement of individual differences. His work in those areas and in statistics have profoundly influenced the development of modern psychology and, particularly, the emergence of functionalism. For example, his work was a major influence on Cattell, who later became instrumental in the development of American functional psychology.