The Digestive System. 45 



folds, forming a valve, thus preventing the return of food 

 (vomiting, etc.) to the mouth; in cattle and sheep its en 

 trance is, however, funnel-shaped, a condition favorable 

 to the return of food to the mouth. 



The Stomach. The digestive tract has been described 

 as a tube with sacs or enlargements, the first of which is 



I 



STOMACH OF A HORSE. 



G. The gullet (esophagus). 



the stomach. In the horse and pig it is a single sac; in 

 cattle and sheep, an organ with four compartments, viz: 

 the paunch or rumen, situated in the left flank of the ani- 

 mal, the honeycomb or reticulum, the manyplies or omasum, 



