HOLMES ANNIVERSARY VOLUME 



creased fecundity of the American half-breed group is additional 

 proof that amalgamation decreases fecundity, because the so-called 

 American half-breed group is in reality more pure-bred than the so- 

 called pure-bred American group, since the "American" family is the 

 highly amalgamated family. 



Supporting evidence that amalgamation decreases fecundity is pre- 

 sented by the fourth column of figures in each half of Table B. In 

 these columns are shown the average number of married years of the 

 mothers (to the age of 42) per child born. In the Swedish, German, 

 Irish, and Norwegian groups more married years are required per child 

 in the half-breed families than in the pure-bred families. The Scotch, 

 English, Canadian, and American groups are exceptions. But the few- 

 ness of the Scotch and Canadian families may explain their cases. The 

 American is really not an exception, for the reason noted in the pre- 

 ceding paragraph. The English group offers a clear-cut and outstand- 

 ing exception, however. 



TABLE B 



RELATIVE FECUNDITY OF PURE-BRED AND HALF-BREED FAMILIES IN SIOUX 



FALLS, SOUTH DAKOTA 



Ethnic Group 



Pure-bred Families 





o 



Z 



U 



o 

 Z 



a 

 u 

 ■V 



■£>■ 



z^ 



> 



< 



0) 



53 U 



. o. 



£ « 



"^ a 



• <u 



< 



Half-breed Families 



"o 

 6 

 Z 



u 



o 



z 



U- g 



< 



. I 2 - 



O tn 



Z 53 



< 



1 . Swedish . . . 



2. Scotch. . . . 



3. German. . . 



4. English . . . 



5. Irish 



6. Norwegian 



7. Canadian. . 



8. American . 



13 



3 



51 



16 



15 

 40 



3 

 105 



45 

 10 



133 



41 



36 



81 



6 



191 



46 



33 

 61 



56 

 40 

 02 

 00 

 81 



.66 

 .20 

 .60 

 •17 

 •55 

 .29 

 .66 

 •37 



23 

 20 



7i 

 45 

 53 

 42 



15 

 90 



37 

 43 

 85 

 98 

 120 

 56 

 29 



174 



1. 61 

 215 



20 

 18 

 26 

 33 



1-93 

 i-93 



•92 

 .96 

 .88 

 .01 

 .78 

 .64 

 .26 

 • 77 



Lake Benton township, Lincoln county, southwestern Minnesota, 

 is a hilly country with only about 800 inhabitants. We have fecundity 

 data from 54 families in six pure-bred ethnic groups, and from 29 

 families in half-breed ethnic groups in this country district. 



[232] 



