THE OVARY OF THE SPERMOPHILE 149 
Experiment 424-15 (spermophile 232).. Captured in the spring of 
1915. Weight, 205 grams. Operated on September 22, 1915. Both 
ovaries were removed. 
Gross observations. The uterus is normal. 
Sacrificed May 8, 1916. Weight, 117 grams. 
Gross and microscopic observations. Fixative, formalin zenker. 
Stain, hematoxylin and eosin. This uterus shows the same changes as 
that of spermophile 139. (Photograph of this uterus with a normal 
uterus of rut removed the same day (fig. 7). Table for measurements 
of these uteri). 
Experiment 435-15 (spermophile 242.) Captured in the spring of 
1915. Weight, 210 grams. Operated on September 28, 1916. Both 
ovaries were removed. 
Sacrificed May 9, 1916. Weight, 155 grams. The same day a 
control animal, spermophile 233, which was captured the same time as 
spermophile 242, and had lived in the laboratory under the same con- 
ditions, was sacrificed also and the uteri of these two animals were 
photographed together (fig. 8). 
Gross and microscopic observations. Fixative, formalin zenker, 
Stain, hematoxylin and eosin. The uterus of spermophile 242 shows 
all the changes noted in that of spermophile 139. (For dimensions of 
uterus see table.) The control uterus (table) does not show as marked 
enlargement as the uteri of animals brought in from the fields in the 
condition of rut, but aside from this variation in size, the uterus ap- 
pears in every way like a typical one of rut. 
Experiment 436-15 (spermophile 246). Captured in the spring of 
1914. Weight, 95 grams. Operated on July 10, 1914. Both ovaries 
were completely removed. 
Sacrificed September 29, 1915. 
Gross and microscopic observations. Fixatve, formalin zenker. 
Stain, hematoxylin and eosin. Compared with the uteri of the con- 
trols, this uterus shows atrophic changes of a similar nature to those of 
the uterus of spermophile 139, except that the atrophy must be even 
more marked to be noticed in a comparison with the controls of this 
time of the year. 
Experiment 354-16 (spermophile 874). Captured May 20, 1916. 
Weight 128 grams. Operated on May 22, 1916. Both ovaries were 
removed. 
Gross observations. The uterus is undergoing involution. 
Sacrificed October 30,1916. Weight, 120 grams. This uterus was 
photographed with that of a control animal and that of an animal 
Co eens and sacrificed on the same date—spermophile 378 
fig. 9). 
Experiment 358-16 (spermophile 378). Captured May 18, 1916. 
Weight, 115 grams. Operated on May 22, 1916. Both ovaries were 
removed. 
Sacrificed October 30, 1916. Weight, 135 grams. This ae was 
photographed with that of spermophile 374 and a control. 
