428 
Association of Finger-Prmts 
The scale reading for any pair of digits is calculated as follows: — 
Take, for example, the whorls on the right thumb and right fore-finger ; the 
former has 32'5 and the latter 24 per cent, of whorls, while 13 per cent, of right 
hands have whorls on both thumb and fore-finger. Now from independent pro- 
32'5 X 24 
bability we shall expect j^^q q ^ iQ o ^ ^"^ "^'^ P^'^ "double whorls" in 
this combination of digits and we therefore conclude that the remaining 5'2 per 
cent, of double whorls are due to a relationship between the digits. If we set 
aside the 7"8 per cent, out of the 32'5 and 24, we see that from the remaining 
24'7 and 16'2 per cent., the greatest possible percentage of double whorls would 
be 16"2 ; but as the actual percentage in addition to the 7'8 is 5*2, the centesimal 
, • 1 ■ ■ 5-2 X 100 
measure oi the relationship is TTrrq — , or 61, to the nearest unit. 
^ lo"2 
TABLE 6 6. 
Approximate Measures of Relationship between various jmirs of Digits 
on a Centesimal Scale. 
Right Hand 
Left 
Hand 
Couplet 
SL 
LL 
W 
Means 
SL 
LL 
W 
Means 
Thumb and fore-fiuger 
16 
6 
32 
18 
27 
21 
34 
27 
,, middle finger... 
26 
0 
38 
21 
26 
16 
28 
23 
ring 
27 
8 
29 
21 
27 
16 
29 
24 
little 
44 
0 
42 
29 
41 
4 
23 
23 
Fore and middle fingers . . . 
44 
22 
54 
40 
34 
39 
64 
46 
„ ring 
35 
15 
49 
33 
33 
23 
44 
33 
little 
32 
25 
47 
35 
29 
32 
46 
36 
Middle and ring „ 
42 
11 
80 
44 
50 
31 
64 
48 
„ little ,, 
Ring and little ,, 
29 
26 
31 
29 
33 
27 
30 
30 
67 
32 
81 
60 
64 
26 
74 
55 
Couplet 
Two thumbs 
,, fore-fingers 
„ middle fingers 
„ ring „ 
,, little 
SL 
59 
48 
47 
64 
67 
LL 
W 
34 
27 
41 
50 
53 
69 
55 
52 
78 
62 
Means 
54 
43 
47 
64 
61 
Most of the remarks on Table 6 a will be found applicable to Table 6 h, with, 
at most, but slight modification ; the chief differences are that the relationship 
between the middle and little fingers is not so high in Table 6 6 as in Table 6 a, 
and the order for pairs of like digits is not the same in the two Tables. 
