164 PHYSIOLOGY AT THE FAEM. 



parotid are united to each other in a much less intimate man- 

 ner. The volume of the submaxillary is to that of the parotid 

 as one to nine, its weight in an adult hog being nearly three 

 drachms. 



The sublingual gland is somewhat smaller than the sub- 

 maxillary. It is elongated and much less elevated, and less 

 thick before than behind. 



It does not appear that the physiological or the chemical 

 effects of the saliva in the pig have been specially inquired 

 into. 



Pharynx. The pharynx in the pig has the same character 

 as in the horse, ox, and sheep that is to say, it is a conical 

 muscular bag lined with mucous membrane, the muscular fibres 

 being connected with the several adjacent bones. 



Gullet The gullet, as in the horse, the ox, and the sheep, 

 is a very strong muscular canal, passing through the chest be- 

 tween the two sacs of the pleura, and penetrating the diaphragm 

 to reach the abdomen, where it terminates in the cardiac ex- 

 tremity of the stomach. The muscular coat of the gullet has 

 a double layer of fibres arranged in a spiral manner as in the 

 ruminants. 



Stomach. The stomach in the pig differs from the stomachs 

 of the other members of the order pachydermata by its rounded 

 form, which is much more decided than in the others ; by the 

 dimensions of its great cul de sac, as well as by the complexity 

 of that part ; and by the division of the stomach into several 

 compartments. 



The gullet enters the stomach to the right at a considerable 

 distance from the middle of the length of the organ, without 

 making allowance for the extent to be gained were the curva- 

 ture of the great cul de sac straightened. That cul de sac 

 looks upwards and to the right. It is the anterior wall of the 

 stomach which receives the gullet. 



