vi Testing Milk and Its Products. 



PAGE. 



Chap. V. THE BABCOCK TEST FOR OTHER MILK PROD- 

 UCTS 85 



Skim milk, butter milk, and whey. The double-necked 

 test bottle. The Wagner test bottle. The double-sized 

 skim milk bottle. Cheese. Condensed milk. 

 Chap. VI. THE LACTOMETER AND ITS APPLICATION . . 93 



The Quevenne lactometer. Influence of temperature. 

 N. Y. Board of Health lactometer. Reading the lacto- 

 meter. Time of taking lactometer readings. Influence of 

 bi-chromate on lactometer reading. Calculation of milk 

 solids. Adulteration of milk. Legal standards. The 

 specific gravity of the milk solids. Calculation of extent 

 of adulteration: Skimming. Watering. Watering and 

 skimming. 



Chap. VII. TESTING THE ACIDITY OF MILK AND CREAM 108 



Cause of acidity in milk. Methods of testing acidity. 

 Manns' test. Devarda's acidimeter. The alkaline-tablet 

 test. Determination of acidity in sour cream. Spillman's 

 cylinder. Rapid estimation of the acidity of apparently 

 sweet milk and cream. Detecting boracic-acid preserva- 

 tives in milk. "Alkaline Tabs." 



Chap. VIII. TESTING THE PURITY OF MILK 125 



The Wisconsin curd test. The fermentation test. The 

 Monrad rennet test. The Marshall rennet test. 



Chap. IX. TESTING MILK ON THE FARM 131 



Variations in milk of single cows. Number of tests re- 

 quired during a period of lactation in testing cows. When 

 to test a cow. Gurler's method. Sampling milk of single 

 cows. Variations in herd milk. Influence of heavy grain 

 feeding on the quality of milk. Influence of pasture on 

 the quality of milk. Method of improving the quality of 

 milk. 



Chap. X. COMPOSITE SAMPLES OF MILK 148 



Methods of taking composite samples: a. Use of tin 

 dipper, b. Drip sample, c. Scovell sampling tube. d. The 

 equity milk sampler, e. One-third sample pipette. Pre- 

 servatives for composite samples. Fallacy of averaging 

 percentages. 



