BILE IN THE PIG. 167 



three lobes, though it has four divisions. The two middle 

 divisions belong to the principal lobe, which is deeply cut to 

 receive the umbilical ligament. The gall-bladder is a little 

 to the right of this division ; it is buried in a depression of 

 the right portion of this lobe. There are besides two lateral 

 lobes, of which the left is greater than the right without the 

 detached lobule. There is no trace of such a lobule at the base 

 of the left lobe. There is a slight division marking the lobule 

 in the right lobe. 



Though the gall-bladder is wanting in animals allied to the 

 pig, such as the elephant, the rhinoceros, the peccary, the 

 daman, the tapir, yet here it is of great size, and the common 

 duct is also very large. The latter terminates near the pylorus, 

 at some distance from the entrance of the pancreatic duct into 

 the duodenum. 



Pig's bile contains from 10.6 to 11.8 per cent of solid con- 

 stituents, as compared with rather more than 14 per cent in 

 human bile, and from to 10 to 13 per cent in ox bile. Pig's 

 bile has some peculiarities in its composition, which, however, 

 are of too intricate a nature to be detailed here. 



Pancreas. The pancreas or sweetbread in the pig is no 

 more than six times the size of the parotid gland. It has three 

 lobes in the pig. The pancreatic duct ends in the duodenum, 

 six inches farther from the pylorus than the entrance of the 

 common hepatic duct. 



With respect to the chemical constitution of the pancreatic juice 

 in the pig, no particular observations appear to have been made. 



Spleen. The spleen, as in all mammals, is flattened in the pig. 

 It has a much elongated triangular form. Not uncommonly it 

 far exceeds its normal size. It is usually about six times larger 

 than the liver. Its structure may be gathered from what lias 

 been already stated under the head of the spleen in the horse 

 (p. 65). 



