628 



TESTING FOR BUTTERFAT 



Bbuska 1 recommends that 1 cc. of amyl alcohol be added to the 

 test before centrifuging in order to facilitate the separation of the 

 fat, improve the clearness of the fat column and augment the accur- 

 acy of the test. He found, however, that blank tests made by this 

 method also show a layer in the neck of the test bottle, resembling 

 butterfat, and recommends the advisability of additional experimen- 

 tal work with the use of amyl alcohol. 



Pig-. 101 



Skim Milk Test 



Bottle - 



Tig. 102. Wizard Steam Tester 



THE GERBER TEST 



Fig 1 . 103 



Calipers for 



Beading- - 



This test* was invented by Dr. N. Gerber, Zurich, Switzerland. 

 It became available for commercial use in Europe shortly after the 

 introduction of the Babcock test in this country and has found wide 

 application, especially in European countries. 



Apparatus and Chemicals. -1. Acido-butyrometer. This is a 

 glass bulb, extended at its top into a closed, graduated neck. The 

 graduations represent per cent and tenths per cent. The bottom of 



1 Bouska, Report before American Association of Dairy Science, 1918. 



2 Courtesy Louis F. Nafls. 



8 Courtesy Creamery Package Mfg. Co. 



* Gerber, Die praktische Milchprufung, 7th edition, 1900. 



