
FRETS, THE INDEX CEPHALICUS. 529 
Table 26. Correlation coefficients of L and B for large, average 
and small heads. 1561 males. (TOCHER). 








L B H 
Br Nee Ps Ends. lat pecs r 
in m m in mm | in mm | | | 
425—450 30 | 178.47 138.03 77.34 | - 5.9 B55 — 0.4616 
451—460 02111842 02 143.232.1877:152,.403223.59 — 0.498 
461—470 299 | 188.4 146.34 ITO Nt Serle = (AT 
479— 488 720 | 195.45 151.97 115750 13.9321 273255 — 0.3782 
496—505 307 | 202.37 156.54 UU BRNO UGA BETA 0201 
506— 515 86 | 205.37 159.62 TITRE AIS SS 2 — 0.0788 
9160939 21e 210559 A). LGaraa nl 12.002), 5:06 | 4:41 — 0.2435 
mean index of the whole material Ind. = 77.58. 
‘capacity-classes is always about the same. The standarddeviation 
for the length is greater than for the breadth (p. 491); for the length 
it is rather irregular. 
As for the correlationcoefficient of L and B, this is negative 
for all capacity-classes. The correlation-coefficient of length and 
breadth for some arbitrary material is positive (p. 519, tab. 20, 
p. 524) because there the increasing length in the first place points 
to growing capacity, and the length as well as the breadth of heads 
of a growing capacity increase. 
For the material of tab. 26 the influence of the growing capacity 
has been eliminated. 
As for the value of the correlationcoefficients for the different 
capacity-classes of the heads, we see that of the large heads 
(L+ B+ H= 496 to 535 m m) the correlation coefficient is less 
strong negative than for the small heads (L + B + H = 425 to 470 
mm). The correlationcoefficient of the middle-sized heads 
(L + B + H=479 to 488 mm) lies between that for the large and 
small heads. The same we found (tab. 27) for 1970 females of 
TocueEr’s material (Asylums XU— XXI). 
I find further for small heads a larger variability of the indices 
than for great heads (tab. 28). 
From this result we learn that, of small heads an increase of 
the breadth of head is especially accompanied with a decrease of 
the length, and less pith a decrease of the height, and of large heads 
Genetica IV. 34 
