Dr. Reid is the author who has most effectively called attention to this relation between alcohol and natural selection. Those interested will find a full treatment in his books, The Present Evolution of Man, The Laws of Heredity, and The Principles of Heredity.

Principles of Psychology, ii, p. 543.

Leon J. Cole points out that this may be due in considerable part to less voluntary restriction of offspring on the part of those who are often under the influence of alcohol.

For a review of the statistical problems involved, see Karl Pearson. An attempt to correct some of the misstatements made by Sir Victor Horsley, F. R. S., F. R. C. S., and Mary D. Sturge, M. D., in their criticisms of the Galton Laboratory Memoir: First Study of the Influence of Parental Alcoholism, etc.; and Professor Pearson's various popular lectures, also A Second Study of the Influence of Parental Alcoholism on the Physique and Intelligence of Offspring. By Karl Pearson and Ethel M. Elderton. Eugenics Laboratory Memoir Series XIII.