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

A. Marro.Biology and Eugenics.135 
Table X.Conduct: 
Period of: Good. Medium. Bad. 
Immaturity ....................................... 15 = 39% 15 = 39% 8 = 21% 
Complete development .................... 268 = 49% 194 = 35% 84=15% 
Decline .......... 26 = 41% 26 = 41% 10=16% 
Table XI.Intelligence: 
Period of: Good. Medium. Bad. 
Immaturity ................. 18=47% (2% above) 8=21% 12=31% (io%below). 
Complete development 215 = 39% (4% above) 181=33% I50=:27% (6% below). 
Decline ................. 22=35% (3% above) 19=30% 21=23% (8% below). 
In comparing criminals with normal people we can note one preliminary 
fact, namely, the lesser frequency of their issue in marriages where the ages 
correspond. In marriages known to us, whilst for parents of scholars 70% 
were produced amongst individuals of the same period of development, 
amongst criminals we found only 63%. Greater still is the difference in 
the proportion of marriages in the three phases of development of the 
parents; under this head the proportions are the following :— 
Table XII.Scholars.Criminals. 
Parents both at the period of immaturity .................5-8%ir5% 
5555„ complete development84-5%67-4% 
5551„ decline9-5%21'4% 
If we examine the different classes of criminals we find there are three: 
that of assassins, those guilty of rape and those guilty of arson, in which 
parents«, both of immature age are entirely wanting. Rare also are the 
beaters and swindlers, while the class of assaulters, thieves, and idlers, 
abound. Parents both of them aged, are, on the contrary, met with in the class of 
assassins and those accused of rape, and making exception for arsons, their 
proportion exceeds that of the normal in all the classes. 
As regards the scholars, let usi note that with the youth of the two 
parents there coincides with the minimum of good conducts and the maxi­ 
mum of the most developed intelligences.
        

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