364 G. CARL HUBER 
DEGENERATION AND DEATH OF OVA AT THE END OF 
THE SEGMENTATION STAGES 
In figure 2, A and B, are presented drawings of typical sec- 
tions of two morula masses showing complete degeneration and 
death. The degenerated ovum shown in A, of this figure was 
obtained from rat No. 52, 4 days, 15 hours, after insemination. 
In all, eight normal ova were found in the uterus of this rat, 
Fig 2. Ova of the albino rat in late segmentation stages, showing death and 
dissolution of the constituent cells. x 200. A, rat No. 52, 4 days, 15 hours, 
after the beginning of insemination. B, rat No. 68, 4 days, 16 hours, after the 
beginning of the insemination. This figure shows an imperfectly developed 
morula with probable retention of oolemma. 
these showing late morula stages and stages of early blastodermic 
vesicle formation, three of which were sketched and are shown in 
A, B, and C of figure 20, Part I. The degenerated ovum here 
under consideration lies in very close proximity to the normal 
blastodermic vesicle shown in C of figure 20, Part I. The 
shallow mucosal pits harboring the two ova are in contiguity. 
The two contiguous pits resemble each other very much; the 
mucosa underlying them is in every respect the same, indicating, 
it would seem, that to a certain stage in development—to the 
end of segmentation—the development of the degenerated ovum 
proceeded normally. The degenerated egg-mass measured ap- 
proximately 80 u by 50 u by 40 uw. In reaction to stains, it dif- 
fers markedly from the adjacent normal vesicle. The staining 
is very pale; cell boundaries are indistinct or lost, and the nuclei 
scarcely retain any coloring matter. Scattered through the pro- 
toplasm are found small globular masses, perhaps of lipoid 
character. Protoplasm and nuclei present evidences of cytolysis 
and chromatolysis, and have the appearance presented by ne- 
erotic tissue. Had normal development supervened, both ova 
