Feb. 17, 1923 
Inheritance in Swine 
577 
MAMMARY PATTERN 
This subject was treated by the senior author in a detailed study (21) 
based upon many more data than are available in this experiment. 
Therefore, the present data will merely be briefly summarized in so far 
as they bear upon the following points, which are discussed in detail 
in the original study. 
SEAT OF THE GREATEST VARIATION 
The frequency of the occurrence of the nipples and the variations 
in their positions are presented in Table IX. The method of counting 
the position of the mammae is the same as that used in the original paper. 
Table IX .—Number and position of nipples of all pigs 
Number and frequency of pair— 
1 
iM 
2 
2 K 
3 
3 ^ 
• 4 
Number of nipples.... 
Frequency mammae.. 
Frequency variations. 
536 
98.32 
1. 48 
3 
• 56 
466 
86.3 
13-7 
i 
39 
7. 22 
495 
90. 92 
9. 07 
6 
1. 11 
498 
92. 22 
7.78 
Number and frequency of pair— 
4 ^ 
5 
6 
6 K 
7 
7K 
Number of nipples.... 
Frequency mammae.. 
Frequency variations. 
l 6 
3 - 29 
423 
86. 32 
13.68 
46 
9 - 39 
268 
8l. 21 
18.79 
II 
8.33 
124 
93 - 93 
6. 06 
0 
Number and frequency of 
pair— 
8 
; 
8 A 
Inguinal, 
Number of nipples. 
3 
75 
25 
1 
25 
536 
98-53 
1 .47 
Frequency mammae. 
Frequency variations. 
The second wild boar himself possessed but four pairs of mammae 
and the number of mammae in his offspring was so uniformly less than 
in animals of the domesticated breeds that the wild boars and all their 
descendants, which are included in Table IX, are grouped separately 
in Table X. 
Table X. —Number and position of nipples of wild boars and descendants 
Number and frequency of pair— 
i 
1 
iK 
2 
a'A 
3 
3M 
4 
Number of nipples.... 
Frequency mammae.. 
Frequency variations. 
hi 
99.1 
•9 
99 
88. 39 
11. 61 
6 
5 - 36 
104 
92. 86 
7. 14 
I 
•9 
96 
88.89 
II. II 
