334 



SECRETION. 



106. 



bular or oval bodies, from T7 f 5ir to 5 Jo of an inch in diameter, 



which are termed the " colostrum corpuscles." (Fig. 106.) These 



bodies are more yellow and 

 opaque than the true milk- 

 glob ules, as well as being very 

 much larger. They have a 

 well defined outline, and con- 

 sist apparently of a group of 

 minute oily granules or glo- 

 bules, imbedded in a mass 

 of organic substance. The 

 milk-globules at this time 

 are less abundant than after- 

 ward, and of larger size, 

 measuring mostly from soW 

 to TsVff f an i nCR i n dia- 

 meter. 



At the end of a day or 

 two after its first appearance, 



the colostrum ceases to be discharged, and is replaced by the true 



milky secretion. 



The milk, as it is discharged from the nipple, is a white, opaque 



fluid, with a slightly alkaline reaction, and a specific gravity of 



about 1030. Its proximate chemical constitution, according to 



Pereira and Lehmann, is as follows : 



COLOSTRUM COKPTSCLES, with milk-globules 

 from a woman, one day after delivery. 



COMPOSITION OF Cow's MILK. 



Water 



Casein 



Butter 



Sugar ........ 



Soda 



Chlorides of sodium and potassium . 

 Phosphates of soda and potassa 



Phosphate of lime 



" magnesia ..... 



" " iron 



Alkaline carbonates ...... 



870.2 

 44.8 

 31.3 

 47.7 



6.0 



1000.0 



Human milk is distinguished from the above by containing less 

 casein, and a larger proportion of oily and saccharine ingredients. 

 The entire amount of solid ingredients is also somewhat less than 

 in cow's milk. 



