158 



DIGESTION. 



Fig. 33. 



CONTENTS OP STOMACH DURING DIGESTION 

 OF MEAT, from the Dog. a. Fat Vesicle, filled with 

 opaque, solid, granular fat. &, 5. Bits of partially 

 disintegrated muscular fibre, c. Oil globules. 



Fig. 34. 



fibres, fat vesicles, and oil drops; substances which are easily 

 recognizable under the microscope, and which produce a grayish 



turbidity in the fluid drawn 

 from the fistula. This turbid 

 admixture grows constantly 

 thicker from the second to 

 the tenth or twelfth hour; 

 after which the intestinal 

 fluids become less abundant, 

 and finally disappear almost 

 entirely, as the process of di- 

 gestion comes to an end. 



The passage of disintegrated 

 muscular tissue into the intes- 

 tine may also be shown, as 

 already mentioned, by killing 

 the animal and examining 

 the contents of the alimentary 

 canal. During the digestion 

 of muscular flesh and adipose 

 tissue, the stomach contains 

 masses of softened meat, 

 smeared over with gastric 

 juice, and also a moderate 

 quantity of grayish, grumous 

 fluid, with an acid reaction. 

 This fluid contains muscular 

 fibres, isolated from each 

 other, and more or less dis- 

 integrated, by the action of 

 the gastric juice. (Fig. 33.) 

 The fat vesicles are but little 

 or not at all altered in the 

 FROM DUODENUM OP DOG, DURING DIGES- stomach, and there are only 



TION OF MEAT.-. Fat Vesicle, with its contents & fe w fr QQ ^j ff l o t, u l es to fc e 



diminishing. The vesicle is beginning to shrivel and 



the fat breaking up. b, b. Disintegrated muscular SQQH floating in the mixed 



fluids, contained in the cavity 



of the organ. In the duodenum the muscular fibres are further 

 disintegrated. (Fig. 34.) They become very much broken up, pale 

 and transparent, but can still be recognized by the granular mark- 

 ings and striations which are characteristic of them. The fat vesi- 



