CONSANGUINEOUS MARRIAGES 



257 



in which the parents came from different countries. The results 

 are here given in tabular form: 



Relative Fecutidity of Pure-Bred and Half-Bred Families in Minneapolis 



Pure-Bred Families 



Group 



1 Dutch 



2 French-Canadian 



3 Irish 



4 Swedish 



5 Norwegian 



6 German 



7 Canadian 



8 Scotch 



9 French 



10 Danish 



11 English , 



12 Welsh 



13 American 



14 Scotch-Irish 



No. of 

 families 



30 

 282 



r,022 



4.Q61 



3,028 



3,505 



372 



184 



155 

 246 



523 



77 



8,614 



16 



No. of 

 children 



106 



894 



2,670 



12,564 



7.414 



8,559 



838 



411 



334 



509 



1,014 



127 



13,156 



24 



No. of 

 children 



per 

 family 



53 

 15 

 61 



53 

 44 

 44 

 25 

 23 

 14 

 06 

 93 

 64 

 52 

 5° 



No. of 



amalga- 

 mating 

 groups 



13 

 i6 

 23 

 IS 

 22 



3i 

 13 



18 

 21 

 9 

 20 

 17 

 28 

 15 



flalf-Bred Families 



No. of 

 families 



181 



291 



2,100 



2,004 



2,148 



3.S20 



861 



897 



66s 



265 



1,882 



233 



3,859 



229 



No. of 

 children 



331 



627 

 4,282 

 3.62s 

 3.868 

 6,23s 

 1,670 

 1,602 

 1,251 



471 

 3,252 



399 

 6,392 



395 



Average 

 children 



per 

 family 



Expected 



average 



•4 

 7 

 •4 

 ■4 

 •4 

 . I 

 ■3 

 I 

 . 2 

 . I 

 . O 



.8 

 9 



.8 



The differences between the sizes of homogamic and hetero- 

 gamic marriages are striking. But are they due to differences in 

 the natural fertility or like and unlike unions? It is especially 

 noteworthy that the number of native Americans given in the 

 table is far greater than any other nationality. It is also note- 

 worthy that there are great differences in the size of the families 

 among the people in different countries, — differences which are 

 probably due to a small extent to physiological causes, but are 

 mainly the result of other factors which have been discussed in a 

 previous chapter. In a marriage between a Dutch man or woman 

 and a person of another nation the chances are, other things 

 equal, that the person would be an American, owing to the nu- 

 merical proponderance of the latter stock. Since the size of the 

 American family is notoriously small, the influence of American 

 custom would be a strong element in determining the number of 

 children in the mixed marriage. Persons from nationalities with 

 large families, if marrying outside their group, would be apt to 



