14 CARL G. HARTMAN 
No. 306. Jan. 21, 12 m.; 11 eggs recorded in notes, but only 3 found 
in collection; two of these are 2-celled with both blastomeres in mitosis 
(text fig. 4, A to D; fig. 4, pl. 3; fig. 2, pl. 15); one egg is 3-celled (text 
fig. 4, K; fig. 4, pl. 15). 
No. 306’. Killed Jan. 26, 8:30 a.m. (interval 5 days, 20% hours); 
10 eggs: 2 unfertilized; 8 bilaminar blastocysts 0.7 to 0.75 mm. in 
diameter, of which one has no embryonic area (fig. 7*, pl. 10; fig. 17, 
pl. 13; figs. 2 and 2A, pl. 20; figs. 1 and 1A, pl. 21). 
No. 307. Jan. 21, 3:30 p.m.; 11 eggs removed from left Fallopian 
tube (fig. 7, pl. 1*; figs. 2 to 6, 9, and 10, pl. 14). 
No. 307’. Killed Jan. 27, 9:15 a.m. (interval 52 days); 10 eggs, 
unfertilized and fragmenting (fig. 8, pl. 1*). 
No. 3138. Caught Jan. 19; Jan. 22, 10: 30 p.m., 9 tubal ova, with 
considerable albumen (figs. 1* and 3, pl. 3; figs. 12 and 18, pl. 14). 
No. 313’. Animal died during the night; the 11 eggs taken from 
remaining oviduct had more albumen than the ‘313’ litter; eggs 
poorly fixed (fig. 5, pl. 13). 
No. 314. Copulation a.m., Jan. 20; spermatozoa recovered; Jan. 23, 
7:30 p.m., 9 eggs (fig. 1*, pl. 5; fig. 1, pl. 6); of the 5 eggs sectioned 
one is a blastocyst of 26 cells (fig. 2, pl. 5), 2 contain about 30 cells 
each (fig. 4, pl. 6), and 2 are abnormal (fig. 10, pl. 21). 
No. 314’. Killed Jan. 29, 10 a.m. (interval 5 days, 14% hours); 6 
normal embryos with first rudiment of allantois. 
No. 318. Jan. 23, 26 eggs in early stage of fragmentation, 13 from 
each uterus, in which involution had already set in (fig. 6, pl. 11*). 
No. 320. Received about Jan. 20; Jan. 24, 9 p.m., 13 4-celled eggs 
studied in salt solution; subsequent fixation poor (fig. 1, pl. 1*). 
No. 320’. Jan. 30, 9:25 a.m. (interval 53 days); 17 eggs: 4 unfer- 
tilized; 11 vesicles 2.3 to 2.6 mm. in diameter with well-developed 
primitive streak; one egg contains two vesicles and two embryos; two 
vesicles have no embryonic area (fig. 2, pl. 1*). 
No. 321’. Jan. 25; litter of foetuses near term accompanied by the 
«cee shown in fig. 9, pl. 11*; these eggs are, therefore, nearly 10 days 
No. 332. Jan. 26, 21 eggs (9 plus 12), degenerating, unfertilized, in 
middle stage of pseudopregnancy (fig. 10, pl. 11*). 
_ No. 336. Jan. 27, 9 p.m., 14 eggs (one was lost before photograph- 
ing); the 6 preparations made are young blastocysts of 17, 26, 29, 30, 
mi a 32 cells, respectively (all figures on plate 4*; figs. 18 and 19, 
15 
No. 336’. Killed Feb. 1, 5:45 p.m. (interval nearly 5 days); s 
10-mm. vesicles with small embryos; 2 smaller vesicles. 
No. 337. Jan. 28, 10:30 a.m., 8 eggs: a study of them in salt solution 
seemed to show that one egg was unfertilized, one 8-celled and six 
16-celled; two eggs sectioned are 15- and 16-celled, respectively (fig. 
9; pl. 1*; figs. 3* and/4*% ple peal Gp. 5), 
No. 337’. Feb. 1, 10:30 p.m. (interval 44 days); 14 eggs: 12 blas- 
tocysts, about 2.5 to 4.5 mm., first appearance of medullary groove; 
2 defective blastocysts (eggs in utero, fig. 10, pl. 1*). 
