Infections of the Ovum, Embryo and Fetrus 493 



metritis radiating toward the ovarian end of the uterus. 

 Pus or other pathologic exudate is constantly present in the 

 utero-chorionic cavity or, if the fetal membranes have come 

 away, in the uterine cavity. The exudate and, almost al- 

 ways, the alimentary tract of the fetus contain bacteria, 

 recognizable by cultural and staining methods. The utero- 

 chorionic space of most apparently healthy pregnant cows 

 and the digestive tube of most new-born, apparently healthy 



Fig. 173 — " The Exudate of Contagious Abortion." 



Cross section through the cornua of a pregnant uterus, showing exudate 



in utero chorionic space. 



/, Fetal sac in gravid horn ; 2, fetal sac in non-gravid horn ; s, exudate in 



utero-chorionic cavity of gravid horn ; 4, large masses of exudate 



iu non-gravid horn ; 5, section through cotyledon. 



calves contain bacteria not differing materially from those 

 observed in abortion. In abortion, however, the bacteria 

 are far more abundant. The variation in the abundance of 

 bacteria is more readily studied in the abort, the fetus, and 

 the calf. The amount of infection is very notable in the 

 abort. The prematurely born calf usually bears in its ali- 



