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

D. F. Weeks.Biology and Eugenics.73 
or 11%, are feeble-minded; and 26, or 21%, are neurotic; while 46, or 39%, 
were apparently normal. (See pages 84, 85, Table IV.) (Fig. 14.) 
Fig. 14.—In this case the central mating is of an epileptic man with 
an apparently normal woman (who is probably simplex, as she had an 
epileptic sister). Of the seven conceptions three were miscarriages, the 
first child an epileptic, the next two were twins, one of whom is normal 
and the other neurotic, and the last child died before it was two years of 
age. In the matings of normals on this chart it will be noticed that all 
of the children are normal, they may be either duplex or simplex. E, 
epileptic; F, feeble-minded; I, insane; A, alcoholic; T, tubercular; N, 
normal; b, born; d, died. 
This fitting conforms very closely with what might be expected from 
the type simplex by nulliplex, indicating that the parents who have been 
classified as duplex (normal) are really simplex, in that half their germ cells 
have and half lack the determiner for normality. 
From a study of Table A., it is evident that 20 of the normal parents 
had ancestors who showed some mental or nervous weakness. This would 
justify their classification as simplex. In 26 cases little is known about 
the ancestors of the normal parent. The available information about three 
would indicate that they are mentally normal. Judging from their off­ 
spring, we believe that subsequent data will show that those apparently men­ 
tally normal parents descended from tainted ancestors. 
Eleven matings of an insane and normal parent resulted in 50 concep­ 
tions; 10 died before 14 years of age, 7 are too young for classification. 
Of the 33 remaining, 12, or 36%, were epileptic; 2, or 6%, feeble­ 
minded; 18, or 55 per cent., seemingly normal; while 1, or 3%, was 
neurotic. (See page 85, Table IVa.) 
Simplex x Simplex. 
Under this type of matings we have grouped those fraternities coming 
from matings where neither parent can be classified as normal, or called 
mentally deficient, but showing some mental or nervous weakness.
        

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