THE OVARY OF THE SPERMOPHILE | 155 
Microscopic observations of the ovaries. Right ovary: fixative, 
formalin zenker; stains, hematoxylin and eosin, and Weigert’s copper- 
chrome-hematoxylin. The left ovary was lost. The right ovary 
shows no abnormality. It contains five corpora lutea. They measure 
0.8 mm. x 0.9 mm. in diameter and are in the early lipoid stage, the 
condition which exists about the time of the birth of the fetuses. They 
still contain numbers of red granules, but the lipoid droplets are very 
conspicuous in the cells. In fact, some cells are so full of the lipoid 
that the red granules are in evidence only at the periphery of the cell. 
Experiment 351-16 (spermophile 371). Captured May 20, 1916. 
Weight, 135.5 grams. Operated on May 22, 1916. The left ovary 
was removed. 
Gross observations. The animal is pregnant, the fetuses measuring 
2 cm. in length. The animal gave birth to young, May 31, 1916. 
Sacrificed June 17, 1916. Weight, 130.2 grams. 
Gross observations. The remaining ovary and uterus appear nor- 
mal. There are three spots marking the placental site in the right 
horn and three in the left. 
Microscopie observations of ovaries. Left ovary: fixative, formalin 
zenker, stains hematoxylin and eosin, and Weigert’s copper-chrome- 
hematoxylin. Right: ovary: fixative, acetic osmic bichromate; stain, 
acid fuchsin and methyl green. The left ovary contains three 
corpora lutea. These are in the late red-granule stage. The red 
granules are still quite numerous, but some cells contain lipoid drop- 
lets about their periphery. The right ovary contains three corpora 
lutea of the lipoid stage. It appears very similar to other ovaries 
containing luteal bodies of this stage. There is no demonstrable 
pathology in the ovary. 
Experiment 359-16 (spermophile 379). Captured May 20, 1916. 
Weight, 154 grams. Operated on May 22, 1916. The left ovary was 
removed. 
Gross observations. The animal isin advanced pregnancy. There 
was more trauma experienced in this operation than in the one per- 
formed on spermophile 377, in which both ovaries were removed. The 
animal gave birth to young on May 28, 1916, and kept them until 
June 8, 1916. 
Sacrificed June 24, 1916. Weight, 136.5 grams. 
Gross observations. The placental sites in the uterus are scarcely 
visible. 
Microscopic observations of the ovaries. Both ovaries: fixative, 
formalin zenker; stain, hematoxylin and eosin. The left ovary con- 
tains six corpora lutea of the same stage as the left ovary of spermo- 
phile 371, the late red granule stage. There are a few lipoid droplets 
located through the cells. The right ovary contains four corpora 
lutea of the lipoid stage. There is nothing abnormal about it. 
