THE STORY OF DIGESTION 



31 



system is really a tube running through the body of 

 an animal, having the mouth as its anterior or front 

 opening, and the anus or terminal aperture of the 

 intestine or bowel, as its posterior opening. Diges- 

 tion may be described as the journey of food 



;... 2 



6 



Fig. 6. GENERAL VIEW OF DIGESTIVE TUBE 



(1) gullet, (2) stomach, (3) beginning of intestine, 



(4) small intestine, (5) large intestine, (6) caecum 



with appendix, (7) rectum. 



along this tube, the nutriment in the course of its 

 travels being acted upon by various fluids or secre- 

 tions poured upon it and so changed and resolved 



