Full text: papers communicated to the first International Eugenics Congress held at the University of London, July 24th to 30th, 1912

F. W. Mott.Medicine and Eugenics.415 
congenital imbecile, a healthy male who has five healthy children, a child 
who died in early life of convulsions, the patient’s mother who became 
insane at the age of 40, a female who became insane at the age of 20, 
two females also suffered with some form of neurosis, lastly, a male who 
died in early infancy. 
The next generation shows the result of mating this unsound stock 
with an almost healthy, sound stock. There are not as many unsound 
members as in the last generation, and we observe that the four members 
that became insane at 19, 25, 30, and 20, all had their first attack at a 
much earlier age than their mother, one of these committed suicide and 
two were found dead; this pedigree illustrates well the signal tendency to 
the occurrence of antedating. The sound members of the stock apparently 
inherited their temperament from the father’s side, and the one member that 
is married has quite healthy children; this looks as if the unsound elements 
of this degenerate stock had been cleared out by segregation of the unsound 
germinal determinants, causing intensification of the disease and occurrence 
of the onset at an early age, thus preventing propagation. 
Fig. 5.—This pedigree shows the result of marriage of first cousins, in 
both of whom there was a latent neuropathic taint. The family consisted 
of three individuals, two sisters, A. and B., and an elder brother who was 
married but had no family. 
B. married a first cousin, and although neither of them was insane 
nor epileptic, yet they had two children epileptic and one a congenital 
imbecile; this terminated the stock on that side. That there was latent 
insanity was shown by the result of the marriage and the fact that a sister 
became insane. A., however, married into a healthy, virile stock; she 
became insane at 38, although living many years after she never recovered, 
the exciting cause was the death of a son by suicide (S.) at 18. There were 
two daughters who became mothers of families, the eldest son of one
        

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