326 HUM4N PHYSIOLOGY 



which is cast out is called locJiia. The lochia is bloody 

 during the first days, during the fifth day it is -serous, later 

 on it becomes grayish. 



The breasts swell much during the second and third days 

 after parturition. The first secretion colostrum is a thick, 

 yellowish fluid, containing colostrum corpuscles (see page 

 112); at the third day real milk is secreted. The period of 

 lactation lasts about ten months, and during this time 

 menstruation does not take place. 



