K. Pearson 
109 
third and second classes of graduates. Table II exhibits tliis result, and Fig. 1 
gives the corresponding scales. 
TABLE II. 
Relative Scales of Intelligence with the range of '^Intelligent" taken as Unity. 
Class 
School Girls 
School Boys 
Graduates 
Class 
Median Individual 
downwards 
007 below top 01 
Slow Intelligent 
Group 
102 below top 01 
Slow Intelligent 
Group 
•043 above bottom 
of 3rd Class 
Median Individual 
downwards 
Median Individual 
upwards 
826 above bottom 
of Slow Intelligent 
Group 
•662 above bottom 
of Slow Intelligent 
Group 
•405 below top of 
3rd Class 
Median Individvial 
upwards 
Range of Slow 
Intelligent 
•833 
•764 
I From -043 from 
y median to co 
Range of Pass 
Degrees 
Range of Slow 
•622 
•652 
Range of Slow Dull 
•620 
•654 
Range of Very 
Dull 
From 2^066 below 
median to oo 
From 1-967 below 
median to co 
Range of Intelligent 
1-000 
1-000 
1^552 
Range of 3rd Class 
Range of 2nd Class 
Range of Quick 
Intelligent 
From r007 above 
median to co 
Fi'om 1-102 above 
median to oo 
From -957 above 
median to oo 
Range of 1st Class 
Thus, as we might have anticipated, to suppose the intelligent to give unit 
range on the intellectual standard provides us with far more concordant results 
than estimating the variability to be the same for boys, girls, and gi'aduates. In 
fact, an examination of Fig. 1 shows for this sort of enquiry surprisingly close 
results. It is clear that the median character is very close to the frontier between 
slow intelligence and intelligence, or between honours and pass in the Cambridge 
academic standard. There is clearly a little shifting of the boundaries of the 
" dull group " between boys and girls, but the mean values of the limits may well 
be taken as within the limits of the probable error. 
After much consideration, I would tentatively suggest the following scale of 
intelligence : 
I divide the range of the "Intelligent" into a hundred units, which I propose 
to term mentaces. It is clear that we can have no absolute measure of the intelli- 
