80 



CREAMERY BUTTER MAKING 



easily handled than in the liquid form. Each tablet con- 

 tains enough alkali to neutralize .034 gram of lactic acid. 

 Apparatus Used for the Test. This is shown in 

 Fig. 23 and consists of a porcelain cup, one 17.6 c.c. 

 pipette, and a 100 c.c. rubber-stoppered graduated glass 

 cylinder. 



CrLJNDER, 



Fig. 23.— Farrington acid test apparatus. 



Making the Solution. The solution is made in the 

 graduated cylinder by dissolving 5 tablets in enough 

 water to make 97 c.c. solution. When the tablets are dis- 

 solved, which takes from six to twelve hours, the solution 

 should be vv^ell shaken and is then ready for use. The 

 solution of the tablets may be hastened by placing the 

 graduate in a reclining position as shown in the cut. 



Making the Test. With the pipette add 17.6 c.c. of 

 cream to the cup, then with the same pipette add an equal 

 amount of water. Now slowly add of the tablet solution. 



