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(1)Introductory .— In Mr. Galton’s ‘Natural Inheritance’ we find theory of regression based upon the “mid-parent.” This formed starting point of my own theory of biparental inheritance. the time Mr. Galton published his theory I venture to think that had not clearly in view some of the laws of multiple correlation which we are now more familiar.

Mathematical contributions to the theory of evolution, On the law of ancestral heredity