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

3° 4Section III.D. C. Gini. 
TABLE VII. 
Marriages and births according to months in Luxemburg, 1901-1903.* 
Daily mean of births for each month, after making the daily mean of births for 
the whole year = 1,000. 
Month of BirthMarriageFFirst-born ¡$r~f-3te Births tj) c'$■ to 
-2 £ 
0 .s 
h pqIllegitimate BirthsIllegitimate and legiti­mate births, excluding legitimate first-bornMonth of 
Marriage 
1234567 
January ...........I3I4102499810591000April 
February ...........120211971108I2ÇOH17May 
March...................820XI73ioçi12451099June April ...................6999091068IIÇI1073July 
May ...................716985107512321083August 
June ...................935893974903971September 
July ..........................870864943781935October 
August ...........¿258996934781927November 
September772915936931936December 
October1412895967768958January 
November ... '...17151210983903979February 
December ...........367955932940932March 
* Data taken from Mouvement de la population dans les Grand Duché pendant Vannée, 1903. 
See pages 123, 124, 125, 132. 
well be that this assertion is well founded for one State and incorrect for 
another. The decisive proof of its truth or falsity for a given country, may 
be established by comparing the frequency of marriages in each month 
with the frequency of conceptions, considering the legitimate first­ 
born and the other births separately. We may make this comparison 
in the case of Luxemburg (see Table VII). The monthly frequency 
of first-born (see Col. 3) differs markedly from that of the other 
legitimate births (see Col. 4) and the total births (see Col. 6). Now these 
differences appeared to be due to the influence of marriages of nine or ten 
months before. In fact, when the marriages of nine or ten months before 
shew a frequency greater than the yearly mean, the frequency of first-born is 
relatively higher than that of other births ; the contrary happens in the opposite 
case. Between the frequency of first born in a certain month and that of marriages 
nine or ten months before we find an undoubted parallelism which would probably 
be even more marked if we were in a position to consider fortnightly rather 
than monthly periods.
        

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