*5 
a 
VJ 
*5 
s: 
*5 
a 
*S 
00 
o 
UJ 
J 
SO 
< 
H 
Proportion, P 2 , 
of females 
exhibitin'^; mature 
complex of re- 
productive 
behavior 
Pit 
(10) 
0.000 
.004 
.031 
.129 
.332 
.542 
.755 
.916 
1.000 
Success, P t , 
at rearing 
litters 
m 
(9) 
0.000 
.079 
.206 
.368 
.564 
.740 
.892 
.985 
1.000 
Incidence, / 2 , 
of successfully 
weaned litters 
(No. per year) 
T-hh 
h 
(8) 
0.00 
1.14 
2.61 
4.04 
5.30 
6.19 
6.79 
7.11 
7.17 
Incidence, /j, 
of pregnancies 
by parous rats 
(No. per year) 
Ii—T/S 
(7) 
15.87 
14.50 
12.68 
10.98 
9.40 
8.36 
7.61 
7.22 
7.17 
Span, 5, in 
days between 
conceptions 
S=t 2 r/p 
(6) 
23.0 
25.2 
28.8 
33.3 
38.8 
43.7 
46.6 
49.2 
51.0 
Proportion 
macroscopi- 
cally 
pregnant 
P 
(5) 
0.000 
.011 
.035 
.089 
.179 
.257 
.285 
.308 
.322 
.333 
Proportion 
macroscopi- 
cally 
parous 
r 
(4) 
0.000 
.015 
.051 
.151 
.351 
.588 
.732 
.845 
.930 
1.000 
Standard 
deviation 
in days 
(3) 
10 
17 
23 
32 
42 
53 
62 
68 
73 
77 
Age in days 
at midpoint 
of length 
class interval 
(2) 
64 
74 
88 
111 
144 
186 
238 
298 
366 
438 
Body length 
in mm. 
(midpoint of 
10 mm. inter- 
val) 
0) 
175 
185 
195 
205 
215 
225 
235 
245 
255 
265 
266 
