ANIMAL PHYSIOLOGY. 



ig. 50. DIGESTIVE TUBE, a, (Esophagus 

 ending in the stomach ; 6, pylorus ; from b 

 to c, duodenum; from c to d, jejunum and 

 ileum with the line of attachment of the 

 mesentery; d, ccecum; e, vermiform appen- 

 dix ; /, g, h, ascending, transverse, and de- 

 scending colon; i, sigmoid flexure; k, rectum. 



as the intestinal 

 extremity is ap- 

 proached, a little 

 to the right of the 

 middle line. The 

 entrance into the 

 intestine is called 

 the pylorus, and is 

 guarded by a 

 strong band of cir- 

 cular fibres, which 

 keeps the opening 

 usually closed, and 

 gives to it the title 

 of pyloric valve. 

 Observations were 

 made by watching 

 the movements of 

 the stem of a ther- 

 mometer, the bulb 

 of which was intro- 

 duced into the 

 stomach of a man, 

 through a fistulous 

 opening which had 

 been left in the 

 healing of a wound 

 made by the acci- 

 dental explosion of 

 a gun; and it ap- 

 pears from them 

 that when the 

 stomach is acting, 

 the contraction of 

 its walls causes its 

 contents to bo 

 moved about in a 

 stream passing from 

 left to right along 

 the great curvature 



