40 
PROFESSOR K. PEARSON ON MATHEMATICAL CONTRIBUTIONS 
h = -1381 ± -0312, 
Ic = -0696 ± -0311, 
r = -3180 ± -0361. 
Illustration V. Inheritance of Stature. —The following data have been found for 
the inheritance of stature between father and son from my Family Data cards, 1078 
cases 
Mean stature of father . . . . 6 7 "'6 9 8 
,, son.GS^bGl 
Standard deviation of father . . 2"'7048 
„ son. . . 2"'7321 
Correlation = '5198 ± '0150. 
Now for purposes of comparison of methods the correlation has been determined 
for this material from various groupings of fathers and sons :— 
(A.) Fathers. 
Class. 
Below 67"'5. 
Above 67"-5. 
Totals. 
Below 67"-5 . . 
269-25 
95-75 
365 
Above 67"-5 . . 
232-25 
480-75 
713 
Totals . . . 
501-5 
576-5 
1078 
(B.) Fathers. 
Class. 
Below 66"-5. 
Above 66"-5. 
Totals. 
Below 67"-5 . . 
211-25 
153-75 
365 
Above 67" - 5 . . 
152-75 
560-25 
713 
Totals . . . 
364 
714 
107S 
