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SURPASSING UPWARD AND DOWNWARD OF THE INDICES, ENZ. (199) 7 

the curves of fig. 1 it results that if the indices of parents are increas- 
ing, the variations of the indices of children are also moving between 
higher values. Both curves of fig. 1 form ascending lines. The irregular- 
ities partly result from the non-equivalence of the material; in families 
with a large number of children the indices will be more diverging than 
in families with but few ones. 
The meaning of the data of table lis consequently that of many 
families in which the parents have indices which mutually difier very 
little, the indices of the children show large differences and also that 
of parents with a higher index the differences of the indices of children 
are moving between higher values than of parents with a lower index : 
there are hereditary differences of the index, so hereditary variations. 
Table II. The indices of children upward surpass those of parents. 
70 cases. (p. 76.) 
Table III. The indices of children downward surpass those of 
parents. (p. 88). 46 cases. 
The families of the tables II and III are ranged in the same way as 
those of table I. The curves of the figures 2a and 3a that are made of 

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Diagram of 70 families of tab. II. 
the large families of the tables II and III — just as in fig. la — show 
that there are cases in which the indices of children show proportional 
mutual differences (p. 186). 


