Grade 



Date. 



(38) 



EXERCISE 19. 



Object. — To determine the effect of adding water before whirling in the 



9-gram cream test. 

 Apparatus. — Sample of cream; Babcock test outfit. 

 Step 1. Weigh into each of two 18-gram bottles 18 grams of cream. 

 Step 2. Weigh into each of two 9-gram bottles 9 grams of cream. 

 Step 3. Add the proper amount of acid to each lot. After standing a few 



minutes add hot water to one half of each lot. 

 Step 4. Mix and finish the tests. 



Report. 



Write a full description of the variations in the above tests with reasons 

 for (a) color, (b) clearness, and (c) correctness of the fat test. 



