54 



DAIRY LABORATORY GUIDE 



EXERCISE 4. 



TEMPERATURE OF THE WATER IN TESTING 



Object: To determine the influence of the temperature 

 of the added water upon the accuracy of the test. 



Apparatus: Sample of milk, two whole-milk bottles, 

 thermometer, and testing outfit. 



Steps : 1. Prepare four test bottles by numbering; then 

 execute the first four steps in Exercise 1. 



2. Add cold water with a temperature of 50 F. to sam- 

 ple No. 1. 



3. Add warm water with a temperature of 100 F. to sam- 

 ple No. 2. 



4. Add hot water with a temperature of 140 F. to sam- 

 ple No. 3. 



5. Add very hot water with a temperature of 180 F. 

 to sample No. 4. 



6. Complete the test as usual, noting the influence of the 

 various temperatures of the water upon the appearance of 

 the fat column and on the accuracy of the test. 



Data: 



