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FRETS, THE INDEX CEPHALICUS. 497 
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Diagram 7. Headlength. 1426 Diagram 8. Headbreadth. 
Women. 1426 Women. 
—_________ Observations. —____- Observation. 
Bee Normal Curve. --.......... Normal Curve. 
WELCKER (1862, p. 72) the skull of newborns should be more 
dolichocephalic than of adults. WELCKER came to this result by 
calculations which have not much value I think. From the table publi- 
shed by PFITZNER (1901) a difference between indices at several ages is 
not obvious. A. Rerzıus (pag. 19) remarks, that a child of two 
years has already its fixed shape of head. E. FIiscHER (1913) 
concludes from investigations of PFITZNER that after the. fourth 
year the head is no more subject to important changes of shape. 
PEARSON (1897, p. 359) calculates the mean headindex of 16000 
American children 6—10 years of age from dates of M. PORTER, 
who gives the mean headlength and the mean headbreadth of 
them. Pearson finds that for boys as well as girls the headindex 
in these years slightly increases for boys from 80.32—80.79, for 
girls from 80.87—81.10). 
For my material the difference between the headindex of adults 
and children appears from tab. 8 (p 498) and tab. 9. The differences 
Genetica IV. 32 
