4i6 



Veterinary Obstetrics 



there are no symptoms which would lead to a diagnosis of the 

 condition during the life of the mother. Ovarian pregnancy is 

 liable at any time to cause the sudden death of the mother, owing 

 to a rupture of the ovary when the fetus has developed within it 

 or a violent detachment of the placenta, by either of which acci- 

 dents fatal hemorrhage is highly probable. 



2. Tubal pregnane}^ is apparently the most common cause of 

 extra-uterine gestation and, in all probability, accounts for the 

 majority of cases of this character. Tubal gestation is more 

 readily understood than other forms. Any defect in the tube, 

 which might cause the arrest of the ovum during its passage 

 through it, would naturally result in the attachment and devel- 

 opment of the embryo at that point. In multiparous animals, if 

 one of the earliest ova should become arrested during its descent. 



Fig. 8i. Extra-uterine pregnancy. Swine. Showing 2 fetuses closely 

 adherent to each other and intimately invested b}' membranes. 



all those on the ovarian side of it would alike become halted in 

 their migration. Consequently, a series of tubal embryos might 

 be formed, which apparently occurs sometimes in domestic 



