10 CARL G. HARTMAN 
Through shell........ 0. 
7 BU 0.70 0.70 0.70 0.68 0.64 
Through blastocyst.. 0.54 55 
0 
0.55x0.4 0.50 0.44 x0.4 0.4 0.47 0.40 
No. 189. Received Jan. 22; operation at 10: 45 a.m., Jan. 23; 10 eggs: 
3 unfertilized; 7 bilaminar blastocysts, mostly about 1.2 mm. in 
diameter; one 0.9 mm. with smaller vesicle probable in dying state 
@Gien18; pli is ehes4 pli: 
No. 189’. Killed at 10:30 p.m. same day (interval 123 hours); 12 
eggs, five of which measured 1.7, 1.7, 1.8, 1.8, 1.9 mm.; stages just 
preceding the beginning of mesoderm formation; no record of unfer- 
tilized eggs (fig. 20, pl. 13; figs. 4, 4A, 7, 8, 8A, 11, 12A, 12B, pl.22). 
No. 191. Jan. 23, 3: 30 p.m., took out left ovary and uterus; 10 eggs: 
one a.defective 16-celled stage, others just completed blastocysts of 
about 35 cells; recorded measurements in salt solution average 0.56 
mm. through shell membrane and 0.14 to 0.15 mm. through ovum 
(fig 210); plaalserhio ssl stale): 
No. 191’. Jan. 26, 9 p.m., removed right uterus, leaving ovary 
(interval 3 days, 53 hours); 11 eggs: 4 bilaminar blastocysts, 1.4 mm. 
in diam. in alcohol, almost no albumen; 7 unfertilized eggs. Animal 
died Feb. 5; no wound infection. 
No. 192. Operated Jan. 23, 4:30 p.m.; 12 eggs: 4 unfertilized; 8 
bilaminar blastocysts measuring mostly about 1 mm. in alcohol, but 
three measure 0.85, 0.90, and 1.20 mm., respectively. In xylol four 
measurements were 1, 1, 1.01, and 1.06, with formative areas 0.62, 
0.67, 0.76, and 0.65 mm., respectively. 
No. 192’. Killed Jan. 24, 11:30 a.m. (interval 19 hours); 15 eggs: 3 
unfertilized; 12 vesicles, of which two measure 1.6 and 2 mm., the 
others about 2.4 mm.; pear-shaped embryonic area with primitive 
streak. 
No. 193. Left uterus and ovary removed Jan. 23, 6 p.m. Number 
of eggs not recorded; collection contains 10 poorly fixed preparations, 
mostly of small blastocysts of 25 to 36 cells, one egg, however, in the 
14-celled stage with two cells in telophase (fig. 8, pl. 3; fig. 9, pl. 13). 
No. 193’. Removed remaining uterus Jan. 26, 8:45 p.m. (interval 3 
days, 2¢ hours); number of eggs not recorded; five measured in salt 
solution 1.15, 1.60, 1.70, 1.70, 1.85 mm.; the first two are bilaminar 
blastocysts; the last three have primitive streaks in pear-shaped 
areas; one l-mm. blastocyst was dead and one of 1.40 mm. has 
imperfect embryonic area; several unfertilized eggs (figs. 1 and 2, 
pl. 10; figs. 1,.9, 9A, 9B, 9C; pl. 22).> Ammaldied’ Jan.) 29 hot an 
intestinal disease common in cage animals. 
No. 194. Jan. 24, 8:30 p.m., found 7 young degenerating eggs like 
those shown in figure 6, plate 11, in left uterus which was removed 
with the left ovary. 
No. 194’. Feb. 9, signs of approaching oestrus returned; Feb. 13, 
10 A.M., copulation observed; killed Feb. 17, 25 days after first opera- 
tion; 18 eggs: 9 unfertilized; 9 vesicles with entoderm only at em- 
byronic area, stage intermediate between Nos. 356 and 352 (fig. 5, 
