APARTMENTS AND FURNITURE. 183 



a duct to the gall bladder and liver. The 

 chambers of these two organs are little more 

 spacious than those of the glands already 

 spoken of which secrete the saliva. The gall 

 bladder may be as large as a man's thumb, or 

 sometimes larger. In the same neighborhood 

 is the pancreas or sweet bread, between which 

 and the main passage through the body there 

 is also a communication. 



ABDOMEN. In this lower story of the house 

 I live in the abdomen there are several 

 other apartments besides those I have already 

 described, some of which open externally, and 

 others do not. But I must now describe 

 another class of apartments : those which do 

 not have communication with the air. 



One of these has already been mentioned : 

 it is the cavity of the chest. Another is the 

 cavity of the cranium, or bones of the head. 

 Another still is in the central part of the brain 

 or contents of the cranium. The last, but most 

 curious and most important which I shall de- 

 scribe, is the great cavity of the circulation ; I 

 mean of the circulation of the blood. 



