342 Anthropometry of Scottish hisane 
TABLE XXII. Pigmentation of Sane and Insane. 
Hair per cent. 
Eyes per cent. 
Bed 
Fair 
Medium 
Dark 
Light 
Medium 
Dark 
Probable distribution of adult Sane Population 
General Insane Population 
4-2 
1-6 
11-5 
6-5 
55-9 
59-5 
28-4 
32-4 
27-8 
45-0 
45-9 
32-6 
26-3 
22-4 
Ditference... 
2-6 
5-0 
-3-6 
-4-0 
-17-2 
1 
13-3 
3-9 
IV. Relationship bettveen Colour and Insanity. This problem can be viewed 
from another standpoint, without dealing either with the observed colour distri- 
butions among the insane or the estimated values among the sane, just discussed. 
The various proportions of the insane among the whole population in each of the 
various districts in Scotland can be compared with the corresponding proportions 
of cliildren possessing any particular hair or eye colour within the same areas. In 
the Report on the Scottish Census of 1901*, the proportion of lunatics per million 
of the population in each county and in the eight chief divisions of Scotland are 
given. From the results of the Pigmentation Survey of Scottish School Children 
lecently carried out by the writer, the proportional colour distributions within the 
same areas can be found. Taking light-eyed children as an example the following 
table (XXIII.) was formed, x-^ being the deviation from the mean percentage of 
light-eyed children, and the corresponding deviation from the mean proportion 
of insane in the eight divisions under consideration. 
TABLE XXIIL 
Division 
^1 
I 
-1-99 
-2735 
II 
- -20 
+ 816 
III 
- -38 
- 206 
IV 
-1-31 
-H 553 
V 
-t-1-94 
4-2431 
VI 
+ -15 
-1549 
VII 
4- -51 
-1084 
VIII 
+ 1 -31 
-f 1772 
The following values of r and of the ratio of r to its probable error Ey were 
obtained by comparing the percentages of the various colours successively with 
the proportion of insane in the eight divisions of Scotland. (Table XXIV.) 
" Eleventh Decennial Census of the Population of Scotland, 1901, with Report, Vol. i. Table XVII, 
page xxix. 
