EXPERIMENT STATION REPORTS. 169 



The left ovary coutaius a cyst about ten millimeters in rliameter. No 

 cultures were obtained from this case. 



Histological examination : The posterior cervical mucosa shows nu- 

 merous cysts varj'iug from single cysts seventy-five microns in diameter 

 to multilobular cysts two to three millimeters in diameter. The cysts 

 are lined with flattened cells resembling endothelial cells, and contain a 

 deeply stained (basic) granular material. 



In the uterine mucosa there is marked lymphocytic infiltration of the 

 stroma with marked peri-glandular fibrosis. The appearance of the 

 mucosa is that of a chronic hypertrophic endometritis. 



There are no marked alterations of the posterior portions of the ovi- 

 ducts except a slight lymphocj'tic infiltration of the stroma with here 

 and there a peri-vascular small round cell infiltration. Tn the middle 

 portion of the oviducts, and to a less extent in the anterior portion there 

 is well marked mucoid degeneration of the, epithelium aud lymphocytic 

 infiltration of the stroma. There is also a marked cellular and granular 

 exudate in the lumen. The appearance of the mucosa is that of an acute 

 catarrhal salpingitis. 



Cow No. 6315 was a coav eight or nine years old. She had been treated 

 several times during the summer by attending veterinarian for failure to 

 conceive. At autopsy the only alterations apparent were hypertrophy 

 of the right lateral portion of the first fold of cervical mucosa and the 

 right ovary contained a cyst ahout the size of a hen egg. 



Histological Examination failed to demonstrate any alterations of 

 the uterine mucosa or of the tubes. 



Considerable time has been devoted to a study of evolution and involu- 

 tion of the cow's uterus during and subsequent to pregnancy. As far as 

 the writer knows no American investigator has devoted any time to this 

 problem. A little work has been done by some of the European inves- 

 tigators but their results are not generally available to the profession 

 in this countr\^ There are two principal reasons w^hy the writer has 

 devoted a part of his time to this problem. First because a knowledge 

 of the physiological processes of the pregnant and involuting uterus is of 

 considerable scientific interest. Second, it is the writer's opinion that a 

 knowledge of these processes Avill explain many of the unsolved problems 

 pertaining to infections of the parturient and post parturient uterus and 

 infections of the fetus. 



An abundance of material is available for the study of evolution of the 

 uterus but the material for study of involution is limited. However, 

 some material is available and we are recording some very interesting 

 observations. We do not feel that the work on this problem is sufficiently 

 advanced to warrant publication of the ohservations already made but it 

 is hoped that the prohlem may be continued. 



Another problem studied cluring the past year is a study of the bac- 

 teriology and histo-pathology of the reproductive organs of calves from 

 abortion infected herds. There are a few investigators of abortion 

 disease who contend that calves from infected herds frequently acquire 

 abortion infection during fetal life or early post-parturient life and 

 harbor this infection throughout calf-hood and abort during their first 

 pregnancy as a result of such infections. A knowledge of the facts in this 

 particular phase of the abortion problem is of great practical value. 

 During the pas-t year opportunity has been afforded to study the bac- 



