Sept. 15, 191S Resemblance of Parents and Offspring of Sheep 



497 



Table XVIII(A). — Correlation between offspring and pairs of parents with "complete 



American" pedigree 



r=o.i2g±o.oii, 



where r is the correlation coefficient between the sum of numbers in litters in which 

 sire and dam are born and the number in corresponding litter in which offspring are 

 bom. 



Means of arrays of offspring: 



(i) When sire and dam are singles i. 3197 ±0. 0094. 



(2) When sire is a single and dam is a twin i. 399 ±0. on. 



(3) When sire is a twin and dam is a single i. 366 ±0. 012. 



(4) When sire is a twin and dam is a twin i. 481 ±0. 014. 



(5) When either sire or dam is a triplet i. 788 ±0. 058. 



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

 states l-i, 1-2, 2-1, . . . of the sires and dams 



o See footnote, Table 1(B). 



There is a slightly smaller proportion of twins among offspring of the 

 "complete American" born than among the offspring of the total popu- 

 lation, but the difference is only about three times its probable error, and 

 there is some question as to its significance. The results obtained from 

 means of arrays are not significantly different whether found from Tables 

 I or XVIII. 



