A DAIRY LABORATORY GUIDE 33 



EXERCISE V 



BABCOCK TEST AND QUEVENNE 

 LACTOMETER 



1. Test in duplicate by the Babcock method a 



sample of whole milk as follows : 



(a) Use ordinary amount of acid. 



(b) One-half usual amount of acid. 



(r) Fill the bottle up to the base of the 



neck with acid. 

 (d) Use the regular amount of acid, but 

 warm the acid and milk before mix- 

 ing until they feel warm to the hand. 

 Add the acid slowly to the sample. 

 Observe and record all results care- 

 fully. 

 Test for fat a sample of butter. Why is it ad- 

 visable to add the acid slowly in (d) ques- 

 tion I ? 



2. (a) Take a Quevenne lactometer reading of a 



sample of whole milk and skimmed 

 rriilk, making corrections for tempera- 

 ture. 

 Explain fully the effect of temperature on 

 the lactometer readings. 

 (&) Starting with the first reading in 2 (a), 

 what would have been the reading if 

 the temperature had been 54° F., 62° 

 F., 73° F., 81° F.? 



3. Add one-half an acid measure of water to the 



skimmed milk sample and take the Quevenne 



