CHTADEERSE 
SURPASSING UPWARD AND DOWNWARD OF THE INDICES OF PARENTS 
BY THOSE OF THE CHILDREN: 
Table I. There is little difference between the indices of parents 
and much between those of children (p. 66) 54 cases. 
This phenomenon indicates segregation: heterozygous parents with 
indices which differ little may show a very different composition of the 
series of indices of the children (Aa X Aa = AA + 2 Aa + aa). 
The mutual differences of the indices of children are sometimes pro- 
portionable, other times very disproportionable. This is shown by the 
curves of fig. 1a (p. 186). It may simply be the expression of the possibil- 
88.5 

MMSE 
ZEN IN er RR SA 
AV PLEN NE a 
AE LU RENE MR AT = 
ACA LA es Ee 
Ten ae 
ren à 
= A AVANTE, 
| Sj Se 
| Ae 
eae Osan GRA PORTIE N. 
Peel BN It ERA 
N LS Ze! 
Diagram of 54 families of tab. I. The upperline indicates the highest, 
the underline the lowest index of the children of each family. The 
pointillated line indicates the average index of the parents. 
ities of chance. It may also be that parents with the same head-index 
have quite a different hereditary constitution oftheindex (p. 46). As for 
the high indices, we often find small and short heads (p. 53). 
The families of table I are ranged according to the average value of 
the indices of the parents and beginning with the lowest values. From 

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Ie Sinas 
bots dir lues en ee cn 
nd rte enaar dl dln: 
NE de Hs Le 
EN PAG 
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