Testing the Acidity of Milk and Cream. 125 



will keep far better than a standard alkali solution, 

 and they can be safely sent by mail; they also require 

 less apparatus and are considerably cheaper than 

 standard alkali solutions; 1000 of these tablets, costing 

 $2.00, will make about 400 tests. 1 Similar alkaline 

 tablets were placed on the market in Europe at about 

 the same time, viz., Stokes ' Acidity Pellets 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>^hnder 

 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 cream, to examine 



1 The tablets are sold by dealers in dairy supplies. 



2 Milchzeitung, 1895, pp. 518-16. 



