750 



Veterinary Obstetrics 



ceedingly difficult to diagnose the condition until the presenting 

 portion of the monster, or we might say the presenting fetus, is 

 completely withdrawn or at least its croup enters the pelvic inlet, 

 when the breech of the second or posterior twin reaches the 

 pelvic inlet, becomes impacted in it and stops further progress. 

 If the operator will then examine carefully, he may be able to 

 reach sufficiently far to determine the character of the monster 

 with which he has to deal. 



The indications in cases of double monsters yary. In many 

 instances they are comparatively small, so that the double con- 



FlG. 128. SCHISTOCEPHALUS. CALF. 



dition does not prevent their extraction entire without serious 

 difficulty. In other cases it is necessary to resort to embryotomy 

 in order to bring about delivery with safety to the mother. 

 There are no specific rules for the operation of embryotomy, but 

 the reduction in the size of the monster is to be carried out ac- 

 cording to the general suggestions already made on page 641. 



It may be well to suggest that it is highly desirable, whenever 

 possible, to divide the double monster into its two halves. That 



