318 PHYSIOLOGICAL CHEMISTRY 



whole of the filtrate. Any metaprotein will precipitate. Filter 

 if necessary and saturate with solid ammonium sulphate. Pro- 

 teoses precipitate. Filter and test for peptones. Gastric diges- 

 tion takes the proteins no lower than peptones. 



Motor Power of the Stomach. 



10. Take by mouth a capsule containing 0.1 gm. iodoform. 

 This is not decomposed until it reaches the intestine. Test saliva 

 for iodine by spitting upon starch paper and dropping one drop 

 of cone, nitric acid upon the spot. A positive test appears in 

 from 1 to 11/ hours. 



Rate of Absorption From the Stomach. 



11. Take by mouth 0.2 g. potassium iodine in a capsule. Test 

 saliva at minute intervals for iodine as in 10. A positive test 

 appears in from 10 to 15 minutes. 



12. Take by mouth a capsule containing 1 gm. of salol. In the 

 intestine this is broken up into phenol and salicylic acid. A 

 violet color imparted to the urine by a few drops of ferric 

 chloride indicates salicylic acid. A test should appear in from 

 1 to 1% hours. 



