PARKER AND BULLARD. — LITTERS AND NIPPLES IN SWINE. 407 



TABLE 8. 

 CORKELATION' BETWEEN THE NiPPLES OF THE RiGHT AND LeFT SiDES OP 



1000 liiTTER OF Pigs, 5970 Individuals. 



In the male pigs, as shown in Table 9, the nipples of the right side 

 range from 4 to 10 with a mean of 6.2+ and a mode at 6; those of the 

 left side range from 4 to 9 with a mean at 6.2 — and a mode at 6. 

 The coefficient of correlation in the males is 0.6359 =•= .0073. 



TABLE 9. 



Correlation between the Nipples of the Right and Left Sides of the 

 Male Pigs in 1000 Litters, 3024 Individuals. 



In the female pigs, as shown in Talkie 10, the nipples of the right side 

 range from 4 to 9 with a mean of 6.0 — and a mode at 6; those of the 

 left side also range from 4 to 9 with a mean of 5.9+ and a mode at 6. 

 The coefficient of correlation in the females is 0.5465 ± .0087. Thus 

 the females show slightly less correlation in respect to their two series 

 of nipples than the males, a condition somewhat different from that 

 found by Davenport and Bullard (1896, p. 96) for the Miillerian 

 glands, which were about equally correlated in the two sexes. 



