



MICROBRACHYCEPHALY. PREPOTENCE. (241) 49 
ability of the indices of sons of parents with average indices is larger 
than of sons of parents with high or with low indices. The variability of 
the indices of sons of parents with low indices is smaller than that of 
sons of parents with high indices, as we already found (p. 39). In tab. 
XV, the number of sons of parents with average indices is very small. 
For tab. XV, we find again, that the variability of the sons of parents 
with average indices is largest. Of the tables XV, and XV, the indices 
of parents differ 1—1.9 unities. For the tables XV, 4, that contain 
the families, where the indices of the parents differ less than two 
unities, we find, that the variability of sons of parents with average 
indices is larger than of sons of parents with high or with low 
indices. 8 
Tab. XVs-g contain the families, where the indices of the parents 
differ 2-2.9 and 3-3.9 unities. For tab. XV, and XV, the results 
are not in concurrence with expectation; the sons of the class of par- 
ents with average indices here have the lowest variability. In tab. XV, 
and XV, the variability of sons of parents with average indices is 
smaller than of sons of parents with high indices. It is possible, that 
in the families of tab. XV; , the difference of 2-3.9 unities of 
the indices of parents has already a disturbing influence on the 
results. 
Joining all 8 tab. XV, we find, that the variability of the sons of par- 
ents with average indices is still somewhat larger than that of sons of 
parents with high indices and clearly larger than of sons of parents 
with low indices. 
The variability of daughters (tab. 15b) for the different groupings 
of the tables is not so good in agreement with expectation as of 
sons. 
We must take into consideration, that we have to do with rather 
small numbers, and that it would perhaps be possible to correct the 
result, when we looked at the different families, if some disturbing 
elements are present. 
For the daughters too we find, that, joining the numbers of tab. XV, 
1—8, the variability of the indices of daughters of parents with average 
indices is larger than that of daughters of parents with high, or of par- 
ents with low indices. The variability of sons we find for conformible 
classes larger than of daughters. The variability of the indices of sons 
or of daughters of parents with average indices is only little larger than 
(16) 4 
