270 PROF. K. PEARSON" ON THE MATHEMATICAL THEORY OF EVOLUTION. 
The following tables give the chief results :— 
Table I. — Variation. 
Class. 
Number. 
Mean Height 
in inches. 
Probable 
Error 
of M.H. 
S.D. in 
inches. 
Probable 
Error 
of S.D. 
Males. 
683 
69215 
•066 
2-592 
•047 
Husbands. 
200 
69-136 
•126 
2-628 
•089 
Sons. 
483 
69-247 
•081 
2-617 
•057 
Fathers in general . 
935 
69-175 
•055 
2-501 
•039 
Fathers of sons .... 
483 
69-106 
•071 
2-325 
•050 
Fathers of daughters .. 
452 
69-248 
•086 
2-731 
•061 
Females. 
652 
64-04-3 
•061 
2-325 
•043 
Wives. 
200 
63-839 
•no 
2-303 
•078 
Daughters . . . . . 
452 
64-118 
•075 
2-347 
•053 
Mothers in general . 
935 
64-099 
■051 
2-308 
•036 
Mothers of sons .... 
483 
64'054 
■072 
2-334 
•051 
Mothers of daughters . 
452 
64 147 
•072 
2-274 
•051 
Table IT. 
—Correlation. 
Class.- 
Coefficient r. 
Probable Error of r. 
Husbands and wives . 
•0931 
•0473 
Fathers and sons. 
•3959 
•0241 
Fathei’s and daughters 
•3603 
•0250 
Mothers and sons. 
•3018 
•0267 
Mothers and daughters . 
•2841 
- 
•0281 
Table III.—Regression. 
Class. 
Coefficient of Regression. 
Associative Mating : — 
Husbands on wives. 
•1062 
Wives on husbands. 
•0816 
Inheritance :— 
Fathers on sons. 
•3517 
Sons on fathers. 
•4456 
Fathers on daughters. 
•4192 
Daughters on fathers. 
•3096 
Mothers on sous. 
•2692 
Sons on mothers. 
•3384 
Mothers on Daughters. 
•2753 
Daughters on mothers. 
•2932 
