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

L, March.Sociology and Eugenics.27 
THE FERTILITY OF MARRIAGES ACCORDING TO 
PROFESSION AND SOCIAL POSITION. 
(Abstract.) 
By M. Lucien March, 
Directeur de la Statistique Generale de la France. 
Statistics of families furnish, perhaps, the most appropriate data for 
the examination of the factors which govern the productiveness of marriages 
or their sterility. 
Statistics concerning the children born in the eleven and a half million 
French families, classed according to occupation, have been prepared in 
France for the first time as a result of the census of 1906. These 
statistics give information as to the number of children per family, either 
alive on the day of the census or previously deceased, in each occupation, 
for all the families in the whole country taken together, and for the 
different provinces. Further, a special investigation of the 200,000 
families of employees and workmen in the public services has furnished 
more circumstantial details, which have enabled the number of children 
and number of deaths of children in a family to be brought into relation 
with the income of the head. 
The results obtained by the method described above are the subject 
of this report. The effects of occupation, social position and income are 
analysed by means of co-efficients expressing the productiveness of marri­ 
ages, after eliminating the influence of such factors as duration of1 marriage, 
age, and habitat, all of which may obviously affect the productiveness of 
a marriage. These results confirm what has been learnt from previous researches 
of the fertility of different social classes, but they go further in that they 
show that the difference is not exclusively dependent on income. 
In general there are more children per family in the families of work­ 
men than in the families of employers, and the latter contain more than 
those of employees other than workmen. Further, one finds industries in 
which the number of children in the employers’ families is larger than in 
the families of workmen in other industries. Thus, differences are intro­ 
duced by the occupation. Industries employing many hands seem the 
more favourable to the production of large families, both among workmen 
and among employers. Agriculture, in which a large number of persons 
are engaged in France, does not seem to conduce to fertility. Fishermen 
and sailors in the merchant service, on the other hand, appear to form the 
class in which fertility is the most considerable. 
The importance of the occupational factor is such that we could place 
its influence on the same plane as that of “ concentration ” of population,
        

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