




MICROBRACHYCEPHALY. PREPOTENCE. 




(239) 47 
a headlength of parents the headlength of children in some way agree. 
For calculating the headlength of the children for different classes of 








& Tab. 14a. 
i 
| Parents Children. Parents Children. 
„| Dimension 7 
| in regard to Length Breadth | à | im regard to ern + Breadth 
| the mean ll N°, | —— the mean = ae 
\M+elo+e M + elo + e M + € | ANG 
ef 18 5.6 to’ 5.1 4 
ler 9 
152 0.48 | 5.71 f 142 041183 9511012 370 9:3 14 1.82 6.63 
Re t0 "2.3 122: 0.88 | 5.7 5 0.46 10 SEZ Zn 21 0.9 5.9 
CRS 1.8 18 0.4 4.62 8 0.38 8 PAS Zi 7, 1.14 5.6 
ME 2e | 0.5 |557| 31| 0.6 |418f 6] 20, 1.5| 50,10 0.47 22 
MOE | 04 0.39 | 5.16, 98 | :0.3213.70|:4 |: 1.4,,' 0.9 | 99 |. 0.45 7.12 
Ms 03 | 169 | 0.12 | 4.92 | 189 | 0.08 | 4161 2| 08, 0,3 | 127 | 0.15 Ze 
0.2 „ —0.2 | 149 | -0.06 4.67 | 249 0.02 | 4.50 jl OOS RL 2 ORS 229 
20302 0:7:| 140 | -0.27 | 3.52 | 150 —0.27 | 4.45 3 | —0.4 ,, —0.9 75 | -0.18 7.96 
08 1.2 | 62 | -0.45 | 5.33 98 | -0.32 | 4.10 5 | —1.0 ,, —1.5 74 | —0.45 7.9 
7 | 37 |-0.54|7.05| 20 |-0.00|3.92| 7 | -16,—21| 11 | -0.61 5.22 
180222) .. 8:| -1.03 | 5.14 1 —0.7 9 | 2.2 ,, —2.7 18 | —1.4 (15.67) 
pia 2,7 831.033 ponen Pee en ae 1,2104 9.3 
110 —0.48 | 6.06 13 | 3.4 „ -3.9 3 
total [720 1) total [849 2) total | 648) 



parents, the parents of tab. XIV have been joined to classes. Class 1 
contains the parents, where the sum of the headlength of both parents 
lies between + 0.2 and — 0.2 cM. with respect to the average head- 
length. With Class 2 the deviations of the averages are + 0.7 to 4s 
0.3 cM., with Class 3 — 0.3 to — 0.7 cM., etc. Of the children for each 
class the mean and the standarddeviation have been computated. 
These computations have also been done for headbreadth and for 
the sum of length and breadth. I omit the publication of the complete 
tables, because they agree with that for headlength. The means and 
the standarddeviations have been inserted into tab. 14a. 
From this table we see, that for headbreadth the standarddeviation 
of the class of averages is largest. For headlength we find irregular fig- 
‘ures. Perhaps these tables for headlength and headbreadth have not 

> 
A 
3 breadth 0.6 c.M.. 
#1 
a 
The number of observa 
> are more parents with headbreadths than 
he families where the parents differ more 
The difference pro class of parents is for the lengt 
tions of the breadth being so much larger than of the length means that 
with headlengths that do not differ more than 0.5 
than 0.5 c.M. are not inserted into the tables. 
h and for the breadth 0.5 c.M., for the length + 
