666 MILK. 



As milk is the only form of nourishment during a certain period of 

 the life of man and mammals, it must contain all the nutriment necessary 

 for life. This fact is shown by the milk containing representatives of 

 the three principal groups of organic nutritive substances proteins, 

 carbohydrates, and fat, and the last two groups can here also in part 

 mutually substitute each other. Besides this all milk seems to contain, 

 without doubt, some lecithin and nucleon. The mineral bodies in milk 

 must also occur in proper proportions, and on this point the experiments 

 of BUNGE on dogs are of special interest. He found that the mineral 

 bodies of the milk occur in about the same relative proportion as they 

 do in the body of the sucking animal. BUNGE l found in 1000 parts of 

 the ash the following results (A represents results from the new-born 

 dog, and B the milk from the bitch); 



K 2 O.. 114.2 149.8 



Na 2 O 106.4 88.0 



CaO 295.2 272.4 



MgO 18.2 15.4 



FeaOs 7.2 1.2 



P 2 O 6 394.2 342.2 



Cl 83.5 169.0 



BUNGE explains the fact that the milk-ash is richer in potash and 

 poorer in soda than the new-born animal by saying that in the growing 

 animal the ash of the muscles rich in potash relatively increases and the 

 cartilage rich iti soda relatively decreases. In regard to the amount 

 of iron we find an unexpected condition, the ash of the new-born animal 

 containing six times as much as the milk-ash. This condition BUNGE 

 explains by the fact founded on his and ZALESKY'S experiments, that the 

 quantity of iron in the entire organism is highest at birth. The new-born 

 has therefore its own supply of iron for the growth of its organs even at 

 birth. 



The investigations of HUGOUNENQ, DE LANGE, CAMERER and SOLDNER 2 

 have shown that in man the conditions are different from those in animals, 

 as the ash of the child has an entirely different composition as compared 

 with the milk. As an example the following analyses are given (of 

 CAMERER and SOLDNER). (A, the ash of the sucking infant, and B, the 

 ash of the milk.) The results are in 1000 parts of the ash. 



1 Zeitschr. f. physiol. Chem., 13. 



2 Hugounenq, Compt. Rend., 128; de Lange, Zeitschr., f. Biologic, 40; Camerer 

 and Soldner, ibid., 39, 40, and 44. 



