32 DAIRY LABORATORY GUIDE 



warmer. The lamp keeps the air warm and at an 

 even temperature regardless of the weather. In case 

 of extreme cold weather the burner may be turned 

 higher than in warm weather. D represents the slats 

 used in the bottom of the tank which allows the 

 water to come in contact with bottom of the pails 

 or bottles used. 



EXERCISE IX 



Curd Test 



Make curd tests by placing in composite sample 

 bottles, or other convenient glass jars, samples of 



Fig. 27. — Curd of Milk from Sterilized Separator 



various kinds of milk to be tested. Heat to 90° F. 

 and add a few drops of rennet, depending upon the 



Fig. 28. — Curd of milk from separator merely flushed 

 with warm water. The milk in both instances was 

 pasteurized before separating. 



quantity of milk used. Place in incubator or warm 

 room and allow to remain until curdled. Remove 



