54 (246) THE VERY HIGH AND VERY LOW INDICES. 
distribution of frequency. Table b. contains themeans, thestandard- 
deviationsand the coefficients of variation. 
From these tables and curves we see that for the high. indices the 
mean length remains considerably below the general mean; for men 
with 19.34 — 18.71 = 0.63 cM. and for women with 18.36 — 17.76 
= 0.60 cM. For men the breadth surpasses the mean breadth with 
15.96 — 15.4 = 0.56 cM. and for women with 15.25 — 14.8 = 0.45cM. 
For heads with high indices is therefore the decreasing of length some- 
what larger than the increasing of breadth, for men 0.63 — 0.56 = 0.07 
cM. and for women 0.60—0.45 = 0.15 cM. So for women the 
difference is larger than for men. Taking the decreasing of length and 
the increasing of breadth relatively, so taking in view that the length 
3 is larger than the breadth, 
___ then we may say that in 
EEEN EEE ECE EEE rE our material the length of 
ay the heads with high indices 
has decreased in the same 
Des PET I TE Seed ele ees proportion as the breadth 
has increased, certainly for 
the men, for the women the 
decrease of the length is 
somewhat larger than the 
"FI WS JS 1D ws I Was s Is HK 25 5 FS 16 
Fig. 11. Distribution of fequency of indices 75 
and lower. increase of the breadth. 
Fig. 11a. Headlength of 44 females. ers 
Fig. 11b. Headbreath of 44 females. The variability of the 
Fig. llc. Headlength of 87 males. length and the breadth of 
Fig. 11d. Headbreadth of 87 males. heden high indices 
and of those with low ones is for men, as well as for women, some- 
what larger for the length than for the breadth, just as we have found 
for the variability of the whole material (1920b). As well for the length 
as for the breadth for men the variability is larger than for women, just 
as for the whole material. 
The variability of the headdimensions of heads with high indices is in 
all cases somewhat smaller than that of the whole material; for the 
breadth of the women only it is larger. Here we have to consider that 
the number of high indices is relatively small, whereas the whole num- 
ber of indices is very large. The curve of the headbreadth of women : 
(p. 53) is regular (c. p. also 1920b), but is is very broad, the mater- 
ial containing an example of a very small value and another one of a 
- 
RS, oe 
