8 CARL G. HARTMAN 
of eggs, that is, the contents of the left uterus, removed under 
anesthesia and aseptic conditions. The litter of eggs removed 
from the right uterus at a later period is designated by the 
prime of the number given to the animal. Thus, figure 1 in 
plate 1 shows the eggs No. 320 taken from the left uterus of 
animal No. 320 at 9 p.m., Jan. 24; figure 2 shows the eggs yielded 
by the right uterus of the same animal 53 days later, and these 
are designated as No. 320’. The same system applies to 299 
and 299’, 292 and 292’, ete. The first litter of eggs is invariably 
from the left, the second from the right uterus. 
For the reader’s convenience references are made to ‘he 
figures illustrating the respective litters of eggs. An asterisk 
(*) is placed after the figure or plate containing heliotype illus- 
trations of eggs photographed in Ringer’s solution in the living 
state. 
Animals used inthe study. No. 21. Killed three days after attempted 
copulation; mature ovarian eggs (fig. 1, pl. 14). 
No. 28. Captured Aug. 23, when seven or eight months old; kept 
in solitary confinement until Jan. 23, when she was placed with a 
male; male almost killed by female Jan. 26, indicating that oestrus 
had passed. Killed Jan. 27; large undischarged follicles with ripe 
eggs (fig. 1, pl. 13). 
No. 40. Blastocysts near end of entoderm formation with greatly 
attenuated non-formative area (figs. 3 and 4, pl. 18). 
No. 43. Eggs 0.8 to 1 mm., blastocysts bilaminar throughout 
(figs. 4 and 4A, pl. 20), except several like those of No. 40 (fig. 1, 
No. 46. 2- to 5-celled eggs (text fig. 4, P). 
No. 50. Gianna vesicles of about 50 to 70 cells with none or 
with one to several entodermal mother cells (figs. 1 and 3, pl. 7; fig. 11, 
pl. 13; figs. 2 and, spl: 16). 
No. 52. From pronuclear to.4-celled stages, but mostly unseg- 
mented eggs (fig. 21, pl. 14). 
No. 54. About same as preceding. 
No. 55. Numerous bilaminar blastocysts about 1 mm. in diam. 
(figs: 2, 2A, and 6,spleZ)): 
No. 56. Unfertilized tubal ova still devoid of albumen layer (fig. 3, 
pl. 13; figs. 7 and 14, pl.-14). 
No. 58. Undivided, unfertilized uterine eggs. 
No. 76. Tubal ova with small trace of albumen (fig. 2, pl. 13; figs. 8, 
1 13; and 15°to 177 ple): 
No. 81. Fertile eggs, all 4-celled (text fig. 4, N). 
