Data for the ProUem of Evolution in Man. 



23 



discoiu-se) roughly corresponding in their uses to partial coefficients of 

 correlation. 



In Section (lY), the values of the Probable Errors, and the correla- 

 tions of the errors in the chief constants, are obtained. The probable 

 error of Q is 



/ 1 1 1 F 

 0-6745 (AB)"^(A/?)~^(aB)"^(a^)* ' . 



In Section (V), a series of miscellaneous illustrations are given 

 (association of smallpox attack rate and non-vaccination ; association 

 between temper of husband and wife, inheritance of artistic faculty 

 &c., from Mr. Francis Galton's ' Natural Inheritance ' ; association 

 between vigour of offspring and crossing of parentage in plants from 

 Darwin's ' Cross and Self -fertilisation '). 



In Section (VI), the " Association of defects in children and adults," 

 is treated more at length as an example of the methods advocated, the 

 material being drawn mainly from the Keport of the Committee on 

 the Scientific Study - of Childhood. It is shown that the association 

 coefficient is almost uniformly higher for women than men, and for 

 children than adults. This last effect is however a mixed one, due 

 partly to selection, partly to change in the individual, and the 

 material available does not enable us to separate the partial effects. 

 These two laws of association appear to correspond to similar ones 

 for correlation ; women being more highly correlated than men, and 

 children than adults. 



" Data for the Problem of Evolution in Man. III. — On the Mag- 

 nitude of certain Coefficients of Correlation in Man, &c." By 

 Kakl Pearson, E.RS., University College, London. Eeceived 

 November 20 — Piead December 7, 1899. 



1. This paper contains a number of data bearing on the correlation 

 of characters, &c., in man which have been worked out by my 

 collaborators during the last few years, and several of which seem 

 of considerable importance for problems relating to the evolution of 

 man. In each case the data were procured or reduced with a view to 

 answering some problem which had directly arisen during our inquiries 

 as to the action of natural selection on man. Questions as to the 

 alteration of correlation with growth or the influence of homogamy 

 on fertility demand definite answers before the general theory of the 

 influence of natural selection on a growing and reproductive popula- 

 tion can be effectively developed. 



