CYCLIC CHANGES IN UTERUS AND OVARIES. 23 



luteum of the right ovary. Examination eighteen days after 

 previous copulation shows the presence of embryo and placenta 

 in the right horn of the uterus. 



In the left ovary we found young corpora lutea in which a part 

 of the central cavity was still present, while its periphery had 

 been filled by connective tissue; there were small and small to 

 medium-sized good follicles and many follicles in connective 

 tissue atresia. Both uteri show low cuboidal cylindrical epi- 

 thelium of the surface with vacuoles and narrow glands. The 

 surface epithelium and occasionally the gland ducts near the 

 surface contain some mitoses. The rest of the glands and the 

 connective tissue are without mitoses. The connective tissue 

 is fibrillar and without a cell-layer. Ovulation had taken place 

 approximately three to four days previous to examination 

 (fourteen to fifteen days after copulation). The uterus is typical 

 for pregnancy, but does not show the usual cyclic changes. 



(2) No. 752. Ligature left tube near junction with uterus, cut 

 out one corpus luteum from left ovary thirty-three hours after 

 copulation. Seven days after copulation cut out two corpora 

 lutea from the right ovary; examined eighteen days after copu- 

 lation; pregnancy in right horn of uterus. In the left ovary 

 there were three new corpora lutea, in which the central cavity 

 had been filled by connective tissue; one of the corpora lutea 

 contained a retained ovum in the central cavity ; there were small 

 and medium-sized good follicles and various follicles in con- 

 nective tissue atresia; many follicles were in the last stage of 

 connective tissue atresia. There were some atretic yellow bodies, 

 the remnants of former corpora lutea. The right ovary is 

 similar. A new ovulation had taken place about four to five 

 days previously (thirteen to fourteen days after previous copu- 

 lation). In the uterus the cyclic changes are absent: we see low 

 cuboidal or low cylindrical surface epithelium with vacuoles 

 which contain chromatin particles and a number of mitoses, 

 narrow glands without mitoses and fibrillar connective tissue 

 rich in nuclei without mitoses. No cell-layer had been formed. 

 The structure of the uterus is the same on the pregnant and non- 

 pregnant side. 



(3) No. 780. Six days, six hours after copulation, extirpate 



