146 DELLA DRIPS 
Experiment 317-16 (spermophile 353). Captured April 25, 1916. 
Weight, 116 grams. Operated on May 9, 1916. The uterus was 
removed to the cervix. 
Gross observations. The animal is pregnant and, having been kept 
by itself since capture, the period of pregnancy must be at least fourteen 
days. The placental swellings measure 13 mm. in length and 10 mm. 
in width. 
Sacrificed May 20, 1916. Weight, 130 grams. 
Microscopic observations of the ovaries. Right ovary: fixative, 
formalin zenker; stains, hematoxylin and eosin, and Weigert’s copper- 
chrome hematoxylin. Left ovary: fixative, acetic osmic bichromate; 
stain, acid fuchsin and methyl green. There is no pathologic condi- 
tion apparent in the ovaries. The corpora lutea have gone on in their 
normal development. They appear very ‘similar to those of spermo- 
philes whose fetuses are nearing parturition. 
Experiment 318-16 (spermophile 353). Captured April 28, 1916. 
Weight, 127 grams. Operated on May 9, 1916. The uterus was 
removed to the cervix. 
Gross observations. The animal is pregnant and, since it has been 
kept by itself since capture, it must have been pregnant at least eleven 
days. The placental swellings measure 7 mm. in length. 
Sacrificed May 31, 1916. Weight, 120 grams. 
Gross observations. The ovaries appear very small. The blood 
supply is intact and there are no adhesions. There is a mass of fat 
around each ovary. 
Microscopic observations of the ovaries. The right ovary was 
carefully studied. The other was lost. Fixative, formalin zenker. 
Stains, hematoxylin and eosin, and acid fuchsin and methyl green. 
Many degeneration changes are present all through the ovary. Prac- 
tically all the follicles are degenerating. The corpora lutea show many 
degeneration changes also. There are practically no red granules in 
the cells and many fatty degeneration vacuoles are present. The 
nuclei of the cells show degenerative changes. Their margins are 
indented and their nucleoli are faded and fringed. The strands of 
chromatin are clumped. The capillary sinuses seem dilated and 
filled with blood. Evidently the ovaries have been injured by the 
operation. 
Experiment 331-16 (spermophile 361). Captured May 4, 1916. 
Weight, 141 grams. Operated on May 12, 1916. The uterus was 
removed to the cervix. 
Gross observations. The animal is pregnant, the placental swell- 
ings being 9 mm. in length. 
Sacrificed May 20, 1916. Weight, 120 grams. 
Microscopic observations of the ovaries. Right ovary: fixative, 
formalin zenker; stains, acid fuchsin and methyl green, and hema- 
toxylin and eosin. The left ovary was lost. The right ovary shows no 
abnormality. The corpora lutea have gone on in their development. 
They are just entering the lipoid stage. 
