664 MILK. 



(10 per cent) and heating to 60 C. for 1520 minutes, when the mixture becomes 

 violet-red. Cow's milk gives a yellowish-brown color when thus treated. 



According to RUBNER woman's milk contains about 3 p. m. soaps, but this 

 could not be substantiated by CAMERER and SOLDNER. They conclude that 

 woman's milk contains no soaps, or at least only very small amounts. They also 

 found the quantity of urea nitrogen in woman's milk to be 0.11-0.12 p. m., 

 although SCHONDORFF l found nearly twice this amount, namely, 0.23 p. m. 



, In regard to the quantity of mineral bodies in woman's milk we have 

 the analyses of several investigators, especially of BUNGE (analyses A 

 and B) and of SOLDNER and CAMERER (analysis C) . 2 BUNGE analyzed the 

 milk of a woman, fourteen days after delivery, whose diet contained 

 very little common salt for four days previous to the analysis (A), and again 

 three days later after a daily addition of 30 grams of NaCl to the food 

 (B). The figures are in 1000 parts of the milk- 



ABC 



K 2 0.780 0.703 0.884 



Na 2 0.232 0.257 0.357 



CaO 0.328 0.343 0.378 



MgO 0.064 0.065 0.053 



Fe 2 O 3 0.004 0.006 0.002 



P 2 O 6 0.473 0.469 0.310 



Cl 0.438 0.445 0.591 



The relation of the two bodies potassium and sodium to each other 

 may, BUNGE believes, vary considerably (1.3-4.4 equivalents of potash 

 to 1 of soda). By the addition of salt to the food, the quantity of 

 sodium and chlorine in the milk increases, while the quantity of potas- 

 sium decreases. DE LANGE found more Na than K in the milk at the 

 beginning of lactation. JOLLES and FRIEDJUNG found on an average 

 5.9 milligrams of iron per liter of woman's milk. CAMERER and SOLDNER 3 

 find about the same amount, namely, 10-20 milligrams Fe2Oa = 3.5-7 

 milligrams iron in 1000 grams human milk. 



The gases of woman's milk have been investigated by KtJLZ. 4 He 

 found 1.07 -1.44 cc. of oxygen, 2.35-2.87 cc. of carbon dioxide, and 3.37- 

 3.81 cc. of nitrogen in 100 cc. of milk. 



The proper treatment of cow's milk by diluting it with water and by 

 certain additions in order to render it a proper substitute for woman's 

 milk in the nourishment of children cannot be determined before the 

 difference in the protein bodies of these two kinds of milk has been com- 

 pletely studied. 



J Rubner, Zeitschr. f. Biologie, 36; Camerer and Soldner, ibid., 39; Schondorff, 

 Pfliiger's Arch., 81. 



2 Bunge, Zeitschr. f . Biologie, 10; Camerer and Soldner, ibid., 39 and 44. 



3 De Lange, Maly's Jahresber., 27; Jolles and Friedjung, Arch. f. exp. Path. u. 

 Pharm., 46; Camerer and Soldner, Zeitschr. f. Biologie, 46. 



4 Zeitschr. f. Biologie, 32. 



