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

134Section I.A. Marro. 
Table VIII. 
Intelligence of Pu-pils in Relation to the Age of the Mothers. 
Age of the Mother. Good (superior). Medium. Bad (lowest). 
Of 21 years ............... 43-4 (3*5%) 28-3 28-3 (3-5%) 
From 22 to 36 ............... 39-8 (7*8%) 31-5 28*5 (6*i%) 
From 36 or 37 and over 31-0 (4-6%) 34-4 34'4 (5*7%) 
The greater intelligence would coincide most frequently with the younger 
age of the mothers; nevertheless not in its most evident manifestations, of 
which the higher proportion would be in favour of the second class first 
and then of the third. Nevertheless, in favour of the first class, the mini­ 
mum proportion of defective intelligences would exist which would be at 
the cost of the class including the mothers of middle age, whilst the greatest 
number of inferior intelligences would belong to the aged mothers. 
It now remains in the last place to examine the cases in which both the 
parents are found in the same conditions of immaturity, complete develop­ 
ment and of decline. 
In the different classes of criminals one had the following results :— 
Table IX.Period of 
s ----**"--------------- """ X. 
immaturity. complete develop- decline, 
ment. 
Assassins ........................... 0 = 0% 10 = 55% 8 = 44% 
Blows and injuries ........ 4 = 21% 11 = 57% 4 = 21% 
RaPes ............................... 0 = 0% 14=73% 5 = 26% 
Assaults ........................... 3 = i7% 12 = 70% 2 = 11% 
Arsons ............................... ° = °% 1 = 100% ° = °% 
Swindlers ...................... 2 = 4% 33 = 78% 7 = 16% 
Thieves, idlers, and law­ 
breakers ...................... 20=14% 89 = 65% 27 = 19% 
Amongst the insane, there were born of parents, both aged, a decidedly 
larger proportion of moral lunatics, paralytics, and hypochondriacs. Of 
young couples only four melancholics were born, one hebephreniac, and 
one alcoholic. Subjects of mania and melancholy were descended in great 
proportion from middle-aged couples. 
Amongst pupils studied as regards their conduct at school and as regards 
the degree of intelligence shown, the union of father and of mother both 
at the period of immaturity, of complete development, and of decline gave 
place to the following proportion :—
        

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