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

40Section IV.F. W. Mott. 
5. The most serious obstacles to delivery are effected by deformities of 
the pelvis, in at least 90% of which heredity plays a part. In this 
connection, rickets, the predisposition to which is inherited, takes the foremost 
place. 6. German medical statistics make it appear probable that incapacity to 
bear children is on the increase. 
7. Medical help in childbirth brings, undoubtedly, numerical advantage 
to the race, but it endangers the quality of the race in other ways than 
through the fostering of unfitness for bearing. 
8. The danger of the increase of incapacity for bearing through the 
increase of assistance in childbirth can be combatted :— 
(a) Through the renunciation of descendants by women unfitted to bear 
children. 
(b) Through an energetic campaign against rickets, to which only the 
predisposition can be inherited. 
(1c) Through the permeation of obstetrics with the spirit of eugenics, so that 
the obstetrician no longer proceeds according to a settled rule (living 
mother and living child), but in each separate case takes into con­ 
sideration the interests of the race. 
HEREDITY AND EUGENICS IN RELATION TO INSANITY. 
(Abstract.) 
By F. W. Mott, M.D., F.R.S., 
Physician to Charing Cross Hospital and Pathologist to the ¡London 
County Asylums. 
What is insanity ? Every case of insanity is a biological problem, the 
solution of which depends upon a knowledge of what a man was born 
with—Nature—and what has happened after birth—Nurture. The 
increase of legistered insanity in London; the causes of the increase. 
(1) The standard of insanity has been raised. (2) The increase of accom­ 
modation for reception of the insane. The diminishing death rate in 
asylums causing a progressive accumulation. The diminished number of 
recoveries. (3) The large proportion of old people admitted to asylums 
formerly in the infirmaries. 
Nurture.—The correlation of pauperism, insanity and feeble-minded­ 
ness, alcohol, syphilis, and tuberculosis in relation to insanity and feeble­ 
mindedness. Congenital mental deficiency as distinguished from hereditary 
mental deficiency. Chronic poisoning of the blood by these agencies in
        

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