CONTENTS 



PART I. MILK. 



PACK 



INTRODUCTORY 1 



THE EXAMINATION OF MILK 17 



A. Sampling 17 



B. Physical Examination 22 



I. Determination of the Specific Gravity of Milk 23 



II. Estimation of the Dirt 26 



C. Chemical Examination 30 



I. Determination of the Acidity of Milk 30 



1. The Reaction of the Milk to Litmus Paper 30 



2. The Boiling Test 30 



3. The Alcohol Test 30 



4. Soxhlet-Henkel Method of Titratiou 31 



5. Thorner's Method of Titration 32 



6. Dornic's Method of Titration 32 



II. Determination of the Dry Matter, or Total Solids .... 33 



III. Determination of the Fat 35 



A. Scientific Methods 36 



1. Soxhlet's Araeometer Method 36 



2. Wollny's Refractometer Method 40 



3. Extraction Methods 47 



(a) Adam's Paper Coil Method 48 



(b) Nilson's Kaolin Method 50 



4. Rose-Gottlieb's Method 52 



5. Liebermann-Szekely's Method 55 



(i. Weibull's Desiccation Method for the Estimation 



of Fat in Cream 56 



B. Practical Methods 58 



1. The "Lactocrite" Method 58 



2. Babcock's Method 61 



3. Lindstrom's Butyrometer Method 65 



4. Gerber's Method 69 



5. Siehler's "Sinacid" Bntyrometer Method .... 77 



6. Gerber's "Sal" Method . 80 



