A DAIRY LABORATORY GUIDE 33 



EXERCISE VI 



BABCOCK TEST AND QUEVENNE 

 LACTOMETER 



1. Test in duplicate by the Babcock method a 



sample of whole milk as follows : 

 (o) Use ordinary amount of acid. 

 (&) One-half usual amount of acid. 



(c) 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, ^^'hy is it ad- 

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

 tion I? 



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



sample of \vhole milk and skimmed 

 milk, making corrections for tempera- 

 ture. 

 Explain fully the effect of temperature on 

 the lactometer readings. 

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

 what would have been the reading if 

 the temperature had been ^4" F., 62" 

 F., 73'' F., 81" F.? 



3. Add an acid measure full of water to the 



skimmed milk sample and take the Quevenne 



