CONSANGUINEOUS MARRIAGES 257 
in which the parents came from different countries. The results 
are here given in tabular form: 
Relative Fecundity of Pure-Bred and Half-Bred Families in Minneapolis 
Pure-Bred Families Half-Bred Families 
No. of | No. of Average 
No. of | No. of | children I No. of | No. of | children |Expected 
Group families) children per mating |\|families|\children| per average 
family | groups family 
FE Datehiescacvsewage 30 106 3053 13 181 331 1.83 2.4 
2 French-Canadian......_ 282 804 3-15 16 201 627 2.15 2.7 
3 Anish: schaaaie wane peaches 1,022 2,670 2.61 23 2,100 | 4,282 2.04 2.4 
A Swedish: v3e tei weeatars 4,961 | 12,564 2.53 15 2,004 | 3,625 1.81 2.4 
5 Norwegian............. 3,028 7,414 2.44 22 2,148 | 3,868 1.80 2.4 
6 Geriatr sic decree saat 3,505 8,559 2.44 33 3,520 | 6,235 1.77 Qea 
@ Canadians, « sired ieee’ 372 838 2.25 13 861 | 1,670 1.04 2.3 
SiScotehiss.ccsescse var areas 184 4Ir 2.23 18 897 | 1,602 1.78 2.1 
6 Prench: .'scn-eey pak ees 155 334 2.14 21 665 | 1,251 1.88 2.2 
To: Danishis v.y2va.oe daees 246 509 2.06 9 265 471 1:77 “en 
TE Bnglishvess costs sus tad 4 §23 1,014 1.93 20 1,882 | 3,252 1.72 2.0 
HS Welsh. e ccc scsssc susie capes 77 127 1.64 17 233 399 1.71 1.8 
TZ AMENCAD si aece vers: dase. tee 8,614 | 13,156 1.52 28 3,859 | 6,392 1.66 1.9 
14 Scotch-Irish............ 16 24 I.50 15 229 395 1.73 1.8 
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. Ina 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 
