CONTENTS 



CHAPTER I 



Milk Secretion . . . 



The purpose of milk secretion 

 Physiology of the mammary gland 

 The elaboration of milk in the animal organism 



Early theories 



Present theories . 

 Rate of activity in mammary gland 

 Factors which affect milk secretion 



1-14 

 1 

 2 

 4 

 4 

 7 

 9 

 10 



CHAPTER II 



The Chemical Composition of Milk .... 15-39 



Variation in normal cow's milk 19 



The fats of milk . . . 20 



The composition of milk-fat ..... 20 



The non-volatile fats ...... 22 



The volatile fats 22 



The serum of milk 23 



The proteids or albuminoids .... 23 



Casein 24 



Albumin or lact-albumin .... 24 



Lactoglobulin 24 



Galactin 24 



Fibrin ........ 25 



Milk-sugar . . . . . . . 27 



Citric acid 28 



The mineral constituents or ash .... 28 



Other constituents of milk 29 



Condition of casein and salts in milk ... 29 



Properties and composition of milk-serum . . 31 

 Properties and composition of that part of milk in 



suspension or colloidal solution ' . . 34 

 vii 



