28 CARL G. HARTMAN 
eggs out of 5 from the left uterus, had 9 large, normal embryos 
and one dead embryo in the right uterus three and one-half 
days later, and this in spite of the fact that the animal was 
unusually small and had one of its legs wounded in a trap. But 
of the six large embryos yielded by the left uterus of No. 379, 
an apparently normal female, only one was normal; but 18 
TABLE 3 
Number of abnormal eggs at primitive-streak stages 
TOTAL NUMBER 
OF FERTILIZED 
EGGS 
NUMBER OF 
‘NORMAL EGGS 
NUMBER OF 
LITTER NUMBER ABNORMAL EGGS 
INTERVAL 
a. At first operation 
180 0 5 0 5 
338 0 14 4 18 
380 0 8 2 10 
334 0 11 1 11 
211 0 10 1 11 
Dil 123 hours 8 0 8 
MOG alles arg eto 56 63 
11% 
b. At second operation 
days 
208/ 1 7 1 8 
292’ 4 6 1 a 
320’ 5A tat 2 13 
Sole 4t 10 , 12 
344! 3 a. 0 Th 
356/ 3 6 0 6 
298/ 34 3 3 6 
180’ 1 11 1 12 
334’ 1 0 1 1 
hoGaleeeeeeaec 61 11 71 
15.3% 
hours later all of the 6 embryos in the other uterus proved to 
be normal. ; 
As such cases could be multiplied, the facts are that there is a 
mortality in the opossum ovum at all stages and that the death 
