450 HAYATO ARAI 
mately normally, yet malnutrition as represented by a deficient 
body weight may delay its appearance or even entirely prevent it. 
This is in accord with laboratory observations on breeding. 
TABLE 16 
The relation between the corpora lutea and the body weight. Body, weight, 75 to 
115 grams 
AGE | BODY WEIGHT BODY LENGTH WEIGHT OF Pour CORPORA LUTEA 
OVARIES 
days grams mm. mgm. 
50 75.9 144 12.9 _ 
65 171.2 145 12.2 — 
80 11.3 140 9.4 _— 
69 78.5 148 40.5 + 
100 78.5 138 8.8 = 
80.0 148 ++ 
61 80.5 153 23.0 + 
83 82.0 147 - 
62 $4.0 152 30.8 -- 
112 86.5 148 — 
74 87.3 154 22.1 - 
88 88.6 150 — 
69 88.8 154 34.1: + 
69 90.0 154 23.5 + 
194 90.3 145 14.2 — 
75 91.7 155 22.7 - 
60 93.5 145 10.3 — 
91 93.5 158 ae + 
110 94.3 147 18.9 — 
102 95.0 150 _ 
112 95.8 152 =F 
100 97.8 156 PAV ah + 
75 97.9 156 23 .0 + 
95 98.5 148 12.2 — 
194 100.0 148 15.2 - 
130 103.3 158 33.8 + 
70 106.3 162 43.8 + 
80 107.3 1538 37.4. + 
113.0 167 =F 
64 113.5 165 Sli + 
Finally, I have arranged the data given in table 15 according 
to the body length of the rats. Rats whose body lengths are less 
than 145 mm. and greater than 155 mm. have been eliminated, 
and the results are shown in table 17. 
