14; Organs of Digestion. 



muscle, bone, &c., now goes to repair them. The 

 blood in all cases is the fluid which furnishes the 

 pabulum whence tissues derive their support. 

 That fluid is maintained by regular additions of 

 elements obtained from the food. The process 

 which prepares them we have to consider shortly. 



ORGANS OF DIGESTION. 



The organs of digestion comprise the mouth, 

 teeth, tongue, salivary glands, pharynx, (esophagus 

 or gullet, stomach, intestines, liver, and pancreas" 

 or sweetbread. 



In connexion with the mouth we find appro- 

 priate muscles forming the bulk of the lips and 

 sides for the prehension or gathering of food, and 

 incisor teeth or nippers six above and below in 

 the horse, and eight only below in the ox, sheep, 

 deer, &c. for the purpose of cutting off the 

 herbage. Within the mouth the tongue performs 

 the important office of distinguishing by the 

 peculiar sense of taste, the difference in each 

 variety of substances introduced, and moves them 

 from side to side in order to bring them within 

 the pressure of the molar teeth or grinders. The 

 tongue at length, by a contraction upon itself 

 backwards, carries the bolus of food with it, 

 which is then seized by the pharynx, and passes 

 immediately along the gullet to the stomach. 



The cheeks on each side being formed of 



