Sept. IS. 191S Resemblance of Parents and Offspring of Sheep 



509 



Tables XXXV and XXXVI exhibit data excluded, by the criteria of 

 the section on "Repetition of sires and paternal grandparents," from 

 the "complete American" subgroup. 



Table XXXV. — Sizes of litters in which offspring and pairs of parents are horn, " com- 

 plete American" {from, data excluded in m,aking Table XVIII) 



Table XXXVI. — Sizes of litters in which offspring and sires are born (from data ex- 

 cluded in making Table XXVI) 



GENERAL CONCLUSIONS 



(i) For the class of sheep considered in this investigation we find 

 that, in general, the twin parents give a larger percentage of twins 

 among offspring than do parents born as singles. See Tables I (B) , II (B) , 

 VII(B), IX(B), and XIV(B). 



(2) The small positive correlation coefficient between the sum of 

 numbers in litters in which the two parents are born and the size of 

 litter in which the corresponding offspring are born is significant. The 

 value of the coefficient is in each case more than 1 1 times the probable 

 error. vSee results derived from Tables 1(A) and XVIII (A). 



(3) The small positive correlation coefficients between sizes of litters 

 in which dams are born and sizes of litters in which their offspring are 

 born are decidedly significant when judged by probable errors. See 



