TESTING ACIDITY OF MILK AND HIL.K PRODUCTS IOJ 



THE PURDUE ALKALI TEST 



This test was devised by H. E. Van Norman (Bul- 

 letin No. 104, Purdue Univ. Agr. Exp. Sta., 1905.) 

 The following apparatus (Fig. 40) is used: (i) An 



01 LUTE ALKALI 



SOLUTION 

 ICC=X)I% WITH 

 17.6 CC PIPETTE 

 OF CREAM ETC. 



FIG. 40 PURDUE ALKALI TEST 



ordinary 17.6 cc. pipette, (2) a 100 cc. cylinder, such 

 as is used in the alkaline-tablet test, (3) a 2-quart bot- 

 tle graduated at 1850 cc., (4) sealed bottles, each con- 

 taining 37 cc. of normal solution of sodium hydroxide 

 (caustic soda), (5) a bottle of phenolphthalein indi- 



