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664 MILK.
(10 per cent) and heating to 60° C. for 15 —20 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 Btjnge (analyses A
and B) and of Soldner and Camerer (analysis C).2 Btjnge 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,0 0.780 0.703 0.884
Na,0 0.232 0.257 0.357
CaO 0.328 0.343 0.378
MgO 0.064 0.065 0.053
Fe>03 0.004 0.006 0.002
P2 6 0.473 0.469 0.310
CI 0.438 0.445 0.591
The relation of the two bodies potassium and sodium to each other
may, Btjnge 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 Fe203 = 3.5-7
milligrams iron in 1000 grams human milk.
The gases of woman’s milk have been investigated by Kulz 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.
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., 4(5; Camerer and Soldner, Zeitschr. f. Biologie, 46.
4
Zeitschr. f. Biologie, 32.
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