I3O PHYSIOLOGICAL CHEMISTRY. 



of stomach contents and analyze it according to the following 

 scheme : 



Stomach Contents. 

 Filter and test the filtrate for free hydrochloric acid. 



I 



Filtrate I. Residue. 



Divide into two parts. Discard after making a micro- 



scopical examination. 



I I 



Filtrate II. Filtrate III. 



One-fifth portion. Four-fifths portion. 



Test for : Neutralize carefully ; any precipitate is acid 



(a) Pepsin. metaprotein (acid albuminate). If a pre- 



(b) Bile (see p. 154). cipitate forms filter and divide the filtrate 



(c) Starch. into two parts. If no precipitate forms 



(d) Dextrin. divide the solution into two parts without 



filtering. 



Filtrate IV. Filtrate V. 



Two-thirds portion. One-third portion. 



Heat to boiling to remove coagulable Test for : 



proteins. If any precipitate forms (a) Lactic acid, 



filter it off; if there is no precipi- (fr) Gastric rennin. 



tate proceed directly with the tests. (c~) Salivary amylase. 



Test for: 



(a) Sugar. (Differentiate between the 

 various sugars by the use of the 

 scheme on page 51.) 

 (&) Proteoses. 

 (c) Peptones. 



