Table of Contents. 



PAGE 



Introduction 1 



Chap. I. COMPOSITION OF MILK AND ITS PRODUCTS ... 10 



Composition of milk: Water. Fat. Casein and albu- 

 men. Milk sugar (lactose). Ash. Other components. 

 Colostrum milk. Composition of milk products. 



Chap. II. SAMPLING MILK 23 



Sweet milk. Partially churned milk. Sour milk. Frozen 

 milk. 

 Chap. III. THE BABCOCK TEST MILK 28 



A. Directions for making the test: 



Sampling. Adding acid. Mixing milk and acid. T^hirl- 

 ing bottles. Adding water. Measuring the fat. 



B. Discussion of the details of the test: 



1. Glassware. Test bottles. Marking test bottles. Ap- 

 paratus for cleaning test bottles. Pipettes. "Fool pi- 

 pettes. " Acid measures. The Swedish acid-bottle. Cali- 

 bration of glassware: With water; with mercury. The 

 Trowbridge method of calibration. Calibration of skim-milk 

 and cream test bottles, of pipettes and acid cylinders. 



2. Centrifugal machines. Speed required for the com- 

 plete separation of the fat. Ascertaining the necessary 

 speed of testers. Hand testers. Power turbine and elec- 

 trical testers. 



3. Sulfuric acid. Testing the strength of acid. The 

 Swedish acid tester. Thei color of the fat column an index 

 to the strength of the acid used. Influence of temperature 

 on the separation of fat. 



4. Water to be used in the Babcock test. Reservoir for 

 water. . 



5. Modifications of the Babcock test. The Russian milk 

 test. Bartlett's modification. Siegf eld's modification. 

 Bausch and Lomb centrifuge. 



Chap. IV. THE BABCOCK TEST CREAM 75 



Errors of measuring cream. Weighing cream for test- 

 ing. Cream-test bottles. The Winton cream bottle, 'ixie 

 bulb-necked cream bottle. Cream-weighing scales. Measur- 

 ing cream for testing. Use of milk test bottle. Use of 

 5 cc. pipette. Proper readings of cream tests. 

 Chap. V. THE BABCOCK TEST OTHER MILK PRODUCTS . 88 



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

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

 skim milk bottle. Butter. Cheese. Condensed milk. Ice 

 cream. 



