Full text: Problems in eugenics

16 Exhibit C 43—45. 
A disturbance in the normal proportion of the sexes as a symptom 
C 44 
«C 45of abnormal germ production may also assert itself in the opposite 
direction. O. Lorenz has pointed out the frequent occurrence of an 
extraordinary increase of male children immediately before the 
extinction of a family in the male line. One of the most celebrated 
of these cases is the one of the family of the Emperor Max II. He 
had six sons and two daughters, who all reached the age of maturity, 
but not a single male grandchild in the legitimate male line. 
Fresh evidence is exhibited by von den Vdden in Figure C 44. 
With the families described by von Riffel, who have died out in the 
male line, there is still a great preponderance of boys in the last 
generation in which boys have reached the age of sexual maturity, 
whereas there is a preponderance of females amongst the brothers 
and sisters of the wives of the last male issue of the family. 
Families in Process of Extinction. 
(From Riffel’s Tables, after v. d. Velden in the Archiv für Rassen- und Gesellschafts- 
Biologie, 1909, No. 6.) 
Decrease of frequency of Marriage. High mortality of offspring. 
Of ico adults there marry 
Men : 
Women : 
Decrease of duration of life. 
Average duration of life i/i years 
„38.5Of 100 births there died before the 20th year : 
*5.5 155.1 
Fathers, the only mem­Sons 
■■■39bers of their generationGiandchildren 
who married. 
IfiiArlt'Mothers, with childlessSons 
Men : 
Women:0 33.5 
32.0Reversal of proportion of sexes born. 
To every ICO girls there are born boys: 
In dying-out families : ■■■■■■■ 90 
Disturbance to Proportion of Sexes among the 
Normal: i 
Generation of sonless fathers : 
,, ,, ,, mothers:Normal families. 
Families in process of extinction. 
In this connection another figure, C 45, by von den Velden ought 
to be mentioned. He shows, from investigations made by von Riffel, 
that the physical condition of childless couples is on the average 
inferior to that of fertile parents. This, however, by no means 
holds good in every case. Evidence to the contrary is given by the 
pedigree of an aristocratic family which has died out in the male 
line. It may be looked upon as typical. One generation (the 
second), with three times as many grown up men than women, pro­ 
duces only four Doys (44% of the children), of whom two reach 
maturity. With the fourth generation the male issue dies out.

Note to user

Dear user,

In response to current developments in the web technology used by the Goobi viewer, the software no longer supports your browser.

Please use one of the following browsers to display this page correctly.

Thank you.