DIGESTION AND ABSORPTION. 



99 



In two places it spreads out, as a brook spreads into a 

 pond. One of these en- 

 largements is the stom- 

 ach ; the other, the large 

 intestine. 



5, One layer of the 

 wall of the canal is in- 

 voluntary muscle. Part 

 of the libers run length- 

 wise, and part crosswise; 

 and they surround the 

 tube. 



6, The canal is lined 

 by mucous membrane. 

 Mucous membrane can 

 be seen on the walls of 

 the mouth. It is quite 

 like the skin in struc- 

 ture, but differs in being 

 soft and moist and red. 

 The mucous membrane 

 lines the alimentary 

 canal, and other cavities 

 in the body, just as the 

 skin covers the outside. 



7, We have been 

 speaking of the alimen- 

 tary canal as a whole. 



Different portions of it . ***' 37 ' 



Jr > ALIMENTARY CANAL FROM THE (ESOPHAGUS 



have Special names. DOWN. I. CEBophagns. 2. Stomach. 3. Small 



The first portion is the inte * tiue - 4 ' Large inte8tiDe - 



mouth. Then we come to the throat; then to the oesophagus, 



