CONTENTS xi 



PAGES 



Coloring glymol 128 



Abnormal appearance of the fat column . . 128 



Testing skim-milk and buttermilk .... 129 



Testing frozen milk 130 



Testing sour milk 132 



Testing churned milk 132 



Acidity of milk 132 



Tests for solids not fat and total solids in milk . . 136 



Methods of determining viscosity or consistency . . 143 



Milk sediment test 144 



Test for the detection of formaldehyde . . . 145 



Test for boracic acid 145 



Test for salicylic acid ....... 146 



Test for benzoic acid 146 



Detection of heated milk 147 



Arnold's guaiac method 147 



Microscopic test for heated milk .... 148 



CHAPTER VI 



MARKET MILK 149-205 



Importance of clean milk to the consumer . . . 152 



Importance of clean milk to the producer . . . 152 



Sources of milk contamination 153 



How to produce clean milk 153 



The cows and their care 153 



The stable 155 



The milk-house 157 



Utensils 158 



Milking 160 



Scoring methods of production ' 161 



Treatment after milking 163 



Straining 163 



Aeration ... 164 



Clarification of milk 165 



Cooling of milk 165 



Methods of cooling milk 167 



Refrigerating material ...... 168 



Effect of stirring milk during cooling in tanks . 168 



