498 



Journal of Agricultural Research 



Vol. IV. No. 6 



TABLES FOR DAMS AND OFFSPRING WITH "COMPLETE AMERICAN" 



PEDIGREE 



Table XIX (A) corresponds to Table 11(A) but is limited to data from 

 American-born grandparents. Here we have for the correlation of size 

 of litter in which dams and offspring are bom, 



r = o.i28±o.oio. 



This coefficient is greater than that for the total population by 0.041, 

 and this difference is slightly more than three times its probable error, 

 but it still is far from certain that the difference is not to be attributed 

 to random sampling. 



Table XIX(A). — Correlation between offspring and darns with "complete American." 



pedigree 



Means: 



Dams I. 4486^:0. 0055. 



Offspring i. 3793 ±0. 0054. 



Means of arrays : 



(i) When dam is a single i. 3270^10. 0068. 



(2) When dam is a twin i. 4390±o. 0082. 



(3) When dam is a triplet i. 794 ±0. 067. 



r=0. I28±0. GIG. 



Table XIX(B). — Percentages of offspring in states i, 2, and j to correspond to the 

 states I, 2, and j of the dams 



