Table 45. — Colony b: Area I; April-May 1949 
Rat’s number 
Place of birth 
Maturity 
index 
May 
weight 
May 
wounds 
Surviving young (15) 
Placental 
scars 
Males: 
690 
SAB 
1 . 00 
570 
7 
737 
Area I 
11.75 
453 
7 
Mean 
1.88 
511 
7 
Females: 
92 
Area I 
1.36 
501 
2 
No 
96 
Area I 
1.17 
506 
14 
Yes 
2 
734 
Area I 
11.62 
340 
2 
Yes 
7 
733 
Area I 
1.50 
512 
4 
Yes 
Mean 
1.66 
449 
5. 5 
4.5 
Colony c: Passage 2 , burrow and burrows by Box 10 and 
by the gate ( table 46). 
Despite all of these rats having emigrated from 
their place of birth, the fact that five of the seven 
members consisted of four sibs bom in Area II 
and their mother, female 44, indicates that this 
was a fairly well-knit group. However, their in- 
inability to prevent their major burrow by Passage 
2 from disintegrating into separate segments sug- 
gests that the group was sufficiently disharmonious 
in their relationships to maintain the continuity 
between the separate regions in which the different 
rats lived. Female 378, although living close to 
the others, actually remained somewhat aloof from 
them. Her history is given in detail on pages 
27 to 29. 
Table 46. — Colony c: Passage 2, burrow and burrows by Box 10 and by gate, April-May 1949 
Rat’s number 
Place of birth 
Maturity 
index 
May 
weight 
May 
wounds 
Surviving young (15) 
Placental 
scars 
Males: 
736 
Area I 
11.00 
538 
8 
707 . 
1.86 
498 
12 
Mean 
1.93 
518 
10 
Females: 
378 
SAB 
11.17 
450 
4 
Yes 
21 
48 
Area 11. 
1.19 
525 
4 
Yes 
16 
875 . . . . 
Area II 
II. 10 
441 
2 
No 
27 
925. . 
Area II 
1.50 
492 
26 
No 
5 
63. . 
Area III 
1.14 
530 
4 
No 
6 
44 
SAB 
0) 
Mean 
1.62 
488 
8 
15. 0 
1 She is a wnrwrnl female too old to breed. 
206 
