Grade 



Date. 



(40) 



EXERCISE 21. 



Object. — To note the acidity of milk products, and to compare the method 



of determining the acidity. 

 Apparatus. — Sample of milk; cream; cheese; skimmilk; buttermilk; Far- 



rington's, Mann's and Van Norman's apparatus; solution for ■ acidity 



tests. 

 Step 1. Follow the printed directions for the particular test being used. 



(See rule 6.) 



Apparatus for acid test. 



Farrington's acid test apparatus. 



