172 DISEASES OF THE HORSE. 



lattei'. It is also knoAvii to get wound around the neck or a limb at 

 birth, but in the mare tliis does not seriousl}^ impede parturition, as 

 the loosely attached membranes are easily separated from the womb 

 and no strangulation or retarding occurs. The foal may, however, 

 die from the cessation of the placental circulation unless it is speedily 

 delivered. 



W'ATER IN THE HEAD (HYDROCEPHALUS) OF THE FOAL. 



This consists in the excessive accumulation of liquid in the ventricles 

 of the brain so that the cranial cavity is enlarged and constitutes a 

 great projecting rounded mass occupying the space from the eyes 

 upward. (See Plate XV, fig. 3.) With an anterior presentation 

 (fore feet and nose) this presents an insuperable obstacle to progress, 

 as the diseased cranium is too large to enter the pelvis at the same 

 time with the forearms. With a posterior presentation (hind feet) 

 all goes Avell until the body and shoulders have passed out, when 

 progress is suddenly arrested by the great bulk of the head. In 

 the first case, the oiled hand introduced along the face detects the 

 enormous size of the head, which may be diminished by puncturing 

 it Avith a knife or trocar and cannida in the median line, evacuating 

 the Avater and pressing in the tliin bony walls. With a posterior 

 presentation, the same course must be followed; the hand passed 

 along the neck Avill detect the cranial swelling, which may be punc- 

 tured with a knife or trocar. Oftentimes with an anterior presen- 

 tation the great size of the head leads to its displacement backward, 

 and thus the fore limbs alone engage in the passages. Here the first 

 object is to seek and bring uj) the missing head, and then puncture it 

 as above suggested. 



DROPSY OF THE ABDOMEN IN THE FOAL, OR ASCITES. 



The accumulation of liquid in the abdominal cavity of the fetus is 

 less frequent, but Avhen present it may arrest parturition as com- 

 ])letely as Avill hydrocephalus. With an anterior presentation the 

 foal may pass as far as the shoulders, but behind this all efforts fail 

 to secure a further advance. AVith a posterior presentation the hind 

 legs as far as the thighs may be expelled, but at this point all progress 

 ceases. In either case the oiled hand, passed inward by the side of 

 the foal, Avill detect the enormous distention of the abdomen and its 

 soft, fluctuating contents. The only course is to puncture the cavity 

 and evacuate the liquid. With the anterior presentation this may 

 be done Avith a long trocar and cannula, introduced through the chest 

 and diaphragm ; or Avith a knife an incision may be made betAveen 

 the first tAvo ribs and the lungs and heart cut or torn out, when the 

 diaphragm Avill be felt projecting strongly forward, and may be 

 easily punctured. Should there not be room to introduce the hand 



