CHAPTER III. 



MAMMAET SECRETION. 



Physiological anatomy of the mammary glands Condition of the mammary 

 glands during the intervals of lactation Structure of the mammary glands 

 during lactation Mechanism of the secretion of milk Conditions which 

 modify the lacteal secretion Influence of diet Influence of liquid ingesta 

 Influence of alcoholic beverages Influence of mental emotions Quantity 

 of milk Properties and composition of milk Specific gravity of milk 

 Coagulation of milk Microscopical characters of milk Composition of 

 milk Xitrogenized constituents of milk Non-nitrogenized constituents 

 of milk Inorganic constituents of milk Variations in the composition 

 of milk Colostrum Composition of colostrum Lacteal secretion in the 

 newly-born Composition of the milk of the infant. 



THE mammary glands are among the most remarkable 

 organs in the economy; not only from the peculiar char- 

 acter of their secretion, which is unlike the product of any 

 other of the glands, but from the great changes which they 

 undergo at different periods, both in size and structure. 

 Rudimentary in early life, and in the male at all periods of 

 life, these organs are fully developed in the adult female, 

 only in the latter months of pregnancy and during lactation. 

 It is true, that in the female, after puberty, the mammary 

 glands undergo a marked and rapid increase in size ; but 

 even then they are not fully developed, and if examined 

 with the microscope, will be found to lack the essential ana- 

 tomical characters of secreting organs. The physiological 

 anatomy of the mammary glands consequently possesses 



