Testing the Acidity of Milk and Cream. 123 



make about 400 tests. 1 Similar alkaline tablets were 

 placed on the market in Europe at about the same time, 

 viz., Stokes' Acidity Pelletts in 1893, and Eichler's 

 Saurepillen (acid pills) in 1895. 2 



Two methods of using the tablets have been proposed, 

 one, for the titration (determination of acidity) of rip- 

 ening cream in the manufacture of sour-cream butter; 

 and the other, for determining the approximate acidity 

 of different lots of apparently 

 sweet milk or cream. 



136. Determination of acidity 

 in sour cream. The method is 

 equally applicable for the deter- 

 mination of the acidity of sour 



(2>y hndei 



of 



FIG . 42. Apparatus used for determining the acidity of cream or milk. 



cream, sour milk and buttermilk, but is most frequently 

 employed in testing the acidity of ripening cream, to 

 examine whether or not the ripening process has 

 reached the proper stage for churning the cream. The 

 apparatus used (see fig. 42) is as follows : 



1 The tablets are sold by dealers in dairy supplies. 



2 Milchzeitung, 1895, pp. 513-16. 



