Testing the Acidity of Milk and Cream. 131 



upper limit for milk of the former kind. The appara- 

 tus used in making this test is shown in the accompany- 

 ing illustration (fig. 45), and consists of a white tea- 

 cup; a four-, six-, or eight-ounce bottle, and a No. 10 

 brass cartridge shell, or a similar measure. A solution 

 of the tablets in water is first prepared, one tablet being 

 always added to each ounce of water: four tablets in a 



k "Measure 



FIG. 45. Apparatus used for rapid estimation of the acidity of ap- 

 parently sweet milk or cream. 



four-ounce bottle; six, in a six-ounce bottle, etc., the 

 amount of tablet solution prepared depending on the 

 number of tests to be made at a time. The bottle is filled 

 up to its neck with clean, soft water, and the solution 

 prepared in the manner previously given (140). 



148. Operating the test. As each lot of milk is 

 brought to the creamery in the morning and poured into 

 the weigh can, a cartridge-shell dipper is filled with 



