630 



LACTATION. 



[CHAP. XLIV. 



much influenced by the health and diet of the mother, and by the 

 age of the infant. At first, the caseine is small in quantity, and 

 gradually increases up to its normal standard ; while, on the other 

 hand, the proportion of sugar is very large at first, and subse- 

 quently diminishes in quantity. The proportion of butter varies 

 considerably. Phosphate of lime is very soluble in solutions of 

 caseine, and in this way, no doubt, is introduced into the system of 

 the young animal, 



In disease, the milk may contain blood, pus, or mucous, and 

 occasionally lactic acid and albumen have been detected in it; 

 urea and bile-pigment have also been found in milk. 



Upon the subject of lactation, the student may refer to the following . 

 On the Anatomy of the Breast, by Sir Astley Cooper, 1839. C. Langer, Ueber 

 den bau und die Entwicklung der Milchdriisen, mit 3 Taf., Denkschr. d. 

 Wiener Akad. Bd. iii. Wien. 1851. Article "Mammary Gland," by Mr. Solly, 

 in the Cyclopaedia of Anatomy and Physiology. And Simon's Animal Che- 

 mistry, translated by the Sydenham Society. 



