EXPERIMENT STATION REPORTS. 298 



giancV mucosa aroiuid cotyledons in right horn is a little more vascular 

 than usual. Both oviducts are apparently normal. Eight ovary contains 

 a corpus luteum one and one-half centimeters in diameter in the center 

 of which is a cyst six millimeters in diameter. Left ovary contains a 

 cyst-like structure one centimeter in diameter. Cultures from the uterus 

 and ovaries were negative. 



Histological examination : Other than slight mucoid changes in the 

 cervical epithelium and a fibrous thickening of the transverse cervical 

 folds, no histological changes could be detected in the uterine mucosa. 



Case 20. Grade Shorthorn about six years old. Her last calf was 

 born in January, 1917. She was bred during the late spring or early 

 summer of 1917 and was thought to be with calf. There was no known 

 abortion but during the spring of 1918 she began to come in heat first ' 

 irregularly, but later, during the summer and fall, quite regularly. She 

 has been bred persistently with failure to conceive. She was slaughtered 

 February 11, 1919. 



Macroscopic examination : External cervix is three centimeters in 

 diameter. External os closed. There is a considerable quantity of 

 clear, only slightly ahhesive exudate in external os and covering posterior 

 end of cervix. Cervical canal is six and one-half centimeters in length. 

 Transverse folds of mucous membrane are normal but there is an ap- 

 preciable quantity of rathei' adhesive exudate in canal. Body of uterus 

 is four and one-half centimeters in length. Mucosa is of a light gray 

 uniform color. Cotyledons three millimeters in diameter. Mucosa of 

 horns similar to that of uterine body with an occasional more slightly 

 vascular area. The color of the mucosa is more like that of a heifer's 

 uterus than that of a cow's that has calved. Both oviducts are appar- 

 ently normal. Left ovary is four centimeters in diameter, spherical in 

 shai^e and has a protruding corpus luteum two centimeters in diameter. 

 Right ovary is four centimeters in diameter, and has one cyst two centi- 

 meters in diameter and several smaller ones. Cultures from uterus were 

 negative. B. Coli communior was isolated from cystic ovary. 



Histological examination : Only slight mucoid changes are observed 

 in the cervical epithelium. Otherwise the cervical mucosa is normal. In 

 the mucosa of the uterine body, the sub-epithelial cellular layer is not 

 uniform but in places is indistinct. There is api^arently but little fibrosis 

 but some local edema. A few foci of small round cells ar*e seen in the 

 mucosa. There are no glandular changes. The mucosa of the horns 

 does not differ from that of the uterine body. 



Case 21. Guernsey cow, born May IG, 1911. Becords show following 

 service dates: February 27, 1913; March 30, 1913; December 20, 1913; 

 January 12, 1914; February 3, 1914; March 10, 1914; March 30, 1914; 

 April 10, 1914; April 27, 1914; -May 5, 1914; May 27, 1914; June 30, 

 1914 ; August 9, 1914. Calved May 15, 1915. There is no record of abor- 

 tion nor do the records show the appearance of heat between March 

 30, 1913, and December 20, 1913. Artificial impregnation was attempted 

 by the manager at heat periods from December 20, 1913 to May 5, 1914, 

 inclusive (included in service dates above), and the yeast treatment 

 was given by him on June 30, 1914, and August 9, 1914. After calving 

 the following service records are recorded: July 20, 1915; September 

 9, 1915; September IS, 1915; October 4, 1915; October 21, 1915; Decein- 

 ber 21, 1915; December 31, 1915; January 20, 1910; February 24, 1910; 



