62 
Itiheritance of the Duration of Life 
(15) 
M 
62-191 + -2156 50 + -1174 d 
2 
15-2830 
(16) 
M 

62-564 + -1028 {d + d') 
s 

15-5640 
(17) 
W 
_ 
61-635 + -1161 So 
16-7569 
(18) 
W 

62-521 + -1166 B 
2 
16-2320 
(19) 
W 
_ 
57-728 + -0903 (-S^ + So') 
2 
15-9819 
(20) 
W 

57-222 + -0899 /S'o+-10l7 D 
2 
15-9425 
(21) 
W 

58-585 + -0875 {D + D') 
2 
15-2221 
(22) 
W 

57-500 + -2174 So 
2 
18-0929 
(23) 
W 

55-427 + -3867 d 
2 
18-3199 
(24) 
W 

56-770 + -1972 («„ + V) 
2 
17-9552 
(25) 
W 
_ 
55-290 + -1802 + -4440 d 
17-9290 
(26) 
W 

54-807 + -2903 (c/+ d') 
2 
17-9169 
(27) 
M 

40-429 + -2853 B 
2 
18-6227 
(28) 
M 

46-596 + -2134 Si 
2 
18-4307 
(29) 
M 

34-233 + 2447 5 + -1633 Si 
2 
17-6049 
(30) 
M 

31-455 + -2220 (B + B') 
V 

17-4034 
(31) 
M 

40-476 + -1602 {Si + Si') 
2 

17-1345 
(32) 
W 
_ 
42-390 + -2520 B 
2; 

20-0257 
(33) 
W 
_ 
39-259 + -3222 Si 
2 

19-7491 
(34) 
W 
_ 
30-037 + -1793 i^+ -2784 /Si 
2 
_ 
18-7762 
(35) 
W 
_ 
35-027 + -1961 (B-\-B') 
V 
18-8877 
(36) 
W 
— 
28-971 + -2494 (Si + 8/} 

18-0391 
(37) 
m 

4 158 + -1026 b 
2 

5-9380 
(38) 
m 

3-875 + -1558 Si 
2 

5-7443 
(39) 
in 
_ 
3-565 + 0837 6 + -1448 s; 
2 

5-7498 
(40) 
m 
_ 
3-771 + 0931 {b + b') 
V 

5-8843 
(41) 
111 

3-278 + -1326 (s; + s/) 
2 
5 6140 
(42) 
w 

3-923 + -1322 b 
V 
5-2906 
(43) 
IV 

4-050 + -1748 Si 
2 
5-7935 
(44) 
lU 
_ 
3-442 + -1163 Z)+ 1547 Si 
5-4308 
(45) 
w 
_ 
3-417 + -1199 (b + b') 
2 

5-2214 
(46) 
w 
— 
3-447 + -1488 (s; + s/) 
2 
5-6408 
(47) 
m 
3 223 + -0363 F 
2 
6-3519 
(48) 
m 
3-505 + -0263 M 
2 
6-2968 
(49) 
m 
1-434 + -0363 i^+ -0263 M 
V 
6-3033 
(50) 
w 
4-865 + 0224 F 
6-8120 
(51) 
w 
2-938 + -0490 M 
2 
6-5224 
(52) 
1-777 + 0224 i^ + -0490 M 
2 
6-6307 
Thus equation (2), for example, gives the probable age at death of a man 
when the ages at death of his father and mother are known. These equations have 
been determined by the usual regression formulae of the theory of correlation ; 
but certain assumptions have had to be made in determining them. Thus from 
Table A we see that the variability for their age at death of adult sons of fathers 
