204 
On Criminal Anthrojwmetry 
conclude that by applying the new method to 3000 cases we shall obtain the 
coefficients of correlation to the same degree of accuracy as if we calculated them 
from a full correlation table of 1100 cases. 
As a result of the preceding investigation I conclude that the new method 
(i) saves a gx'eat deal of time and labour ; (ii) gives excellent results for standard 
deviation and mean, especially if the middle division of the 9-fold table is made 
comparatively large ; and (iii) gives less good results for ?■ when r is high, owing 
to the slowness of convergence of the terras in the equation for 0, but on the 
whole it enables us to calculate with an accuracy fairly comparable to that 
attained from an ordinary frequency table containing about one-third the number 
of frequencies. 
(15) I will now state some results, based on Tables 18 and 19, which 
I think are sufficiently novel and important to be emphasised. I note that the 
determinations of Left Foot, so far as I can ascertain, are the first that have been 
made, and have therefore the interest of novelty. 
The following table shows how the mean head measurements of criminals 
compare with those of the British Association and the University College series 
which are given by Dr Alice Lee on page 251 of her memoir, "A first study of the 
Correlation of the Human Skull" (Phil. Trans., Vol. 196); the B.A. measurements 
are averages obtained by Dr Lee from the values given for several years in the 
" Reports of the B.A. Anthropometric Committee "; the University College measure- 
ments were taken by Professor Karl Pearson on twenty-five members of the 
College staff 
TABLE 23. 
3fean Head Measurements. 
B. A. 
U. C. Staff 
Criminals 
Length 
Breadth ... 
198-1 
155-0 
196-38 
153-48 
191-7 
150-4 
As regards variability, Dr Lee's memoir, p. 230, enables me to make the 
following comparison : 
TABLE 24. 
Coefficients of Variation. 
Head Length 
Head Breadth 
Aino Males 
3-195 
2-759 
German Males ... 
3-371 
3-887 
Criminals 
3154 
3-333 
