74 A MANUAL ON THE HOG. 



food, though buried some inches below the surface of the 

 ground. The olfactory nerve, too, is large, and occupies 

 a middle rank between that of the herbivorous, and car- 

 nivorous animals. . . . Few animals, with the exception 

 of the dog, are gifted with a more acute sense of smell than 

 the hog." ^ 



" The hog has fourteen molar teeth in each jaw ; six in- 

 cisors, and two canines ; these latter are curved upwards, 

 and commonly denominated tushes." 



The brain of the hog is larger, in proportion to the size 

 of the body, than the ox, or sheep. This, and the mem- 

 brane surrounding it, are subject to several forms of disease. 



The larynx, or instrument of voice, is an irregular, oblong 

 tube, flexible, and " capable of adapting itself to all the nat- 

 ural, and the morbid changes of the respiratory process. It 

 is placed at the top of the windpipe, guards the exit from 

 the lungs, and prevents the passage of the food into the 

 respiratory canals." 



" The pharynx ... is a membranous, muscular, 

 funnel shaped bag, extending from the root of the tongue 

 to the larynx and oesophagus, wide in front, and becoming 

 graduslly narrower, until it terminates in the oesophagus 

 or gullet. Its office is to convey the food from the mouth 

 to the upper part of the gullet, and this it performs by 

 means of its lining muscles."* 



THE CHEST, OR THORAX. 



This is so well described in Youatt, that his description 

 is given in full. 



" In the human being this (the chest) constitutes the su- 

 perior, and in quadrupeds, the anterior portion of the body ; 

 it is separated from the abdomen by the diaphram. This 

 latter is of a musculo-membranous nature, and is the main 

 agent in respiration; in its quiescent state it presents 

 its convex surface towards the thorax, and its concavity 



*Youatt. 



