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

78Section I.D. F. Weeks. 
as epileptic, 12 or 6% as feeble-minded, with the others tainted or normal. 
(See page 93, Table VIII.) 
In the 131 matings where at least one parent is alcoholic, there were 845 
conceptions. Of the 494 classified, 151, or 31%, were epileptic, 54, or 11%, 
feeble-minded, with the balance tainted or normal. (See page 94, Table IX.) 
Conclusions. 
All the available facts point towards the conclusion that the various 
common types of epileptics seen in institutions lack some element necessary 
for complete mental development, which is also true of the feeble-minded. 
Two epileptic parents produce only defective offspring, when both parents 
are either epileptic or feeble-minded their offspring are also mentally 
defective, the defect taking the form of epilepsy, feeble-mindedness, or 
some other neuropathic condition. 
Our present data shows that epilepsy tends in the successive generations 
to form a larger part of the population, probably due to the greater density 
of the existing defect inside the strains studied. 
In the light of our present knowledge the results obtained from the study 
of our data do not justify the classification of the reported normal parents 
of epileptics as duplex. We are forced to the belief that their germ plasm 
is simplex, and feel confident that more complete data would show the taint 
in their ancestors. 
Our data seems to support the belief that alcohol is a cause of defect, in 
that more children of alcoholic parents are defective than where alcoholism 
is not a factor. 
That there are more than five times as many epileptics as feeble-minded 
persons in those fraternities coming from matings where neither parent can 
be classed as normal, or called mentally defective, seems to indicate that 
neurotic and otherwise tainted conditions are more closely related to 
epilepsy than to feeble-mindedness. 
It will be seen from the present evidence that epilepsy cannot be con­ 
sidered as a Mendelian factor, when considered by itself, but that epilepsy 
and feeble-mindedness are Mendelian factors of the recessive type, in that 
their germ cells lack the determiner for normality, or are nulliplex in 
character, while the tainted individuals, such as neurotics, criminals, sex- 
off enders, etc., are simplex, and the normals duplex or simplex in 
character. I am indebted to our field worker, Mrs. D. Lucile Field Woodward, for 
the preparation of the tables and charts, and for valuable suggestions and 
assistance in the preparation of this paper.
        

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