Probability, the foundation of eugenics : the Herbert Spencer lecture delivered on June 5, 1907 / by Francis Galton.

  • Galton, Francis, 1822-1911.
Date:
1907
Catalogue details

Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: Probability, the foundation of eugenics : the Herbert Spencer lecture delivered on June 5, 1907 / by Francis Galton. Source: Wellcome Collection.

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    and is expressed by a single figure. For example: if the thigh-bone of many persons deviate ‘ very much * from the usual length of the thigh-bones of their race, the average of the lengths of the corresponding arm- bones will differ ‘much’, but not ‘very much’, from the usual length of arm-bones, and the ratio between this ‘very much’ and ‘much’ is constant and in the same direction, whatever be the numerical value attached to the word ‘ very much \ Lastly, the trustworthiness of the Index of Correlation, when applied to individual cases, is readily calculable. When the closeness of correlation is absolute, it is expressed by the number i-o, and by o-o, when the correlation is nil. (New words and ideas—Correlation and Index of Correlation.) This concludes what I have to say on these suggested Object lessons. It will have been tedious to follow in its necessarily much compressed form but will serve, I trust, to convey its main purpose of showing that a very brief course of lessons, copiously illustrated by diagrams and objects to handle, would give an acceptable introduction to the newer methods employed in Biometry and in Eugenics. Further, that when read leisurely by experts in its printed form, it would give quite sufficient guidance for elaborating details.