SALTS 



19 



iodine (brown), and the xantho proteic reaction. On hydrolysis 

 with hydrochloric acid it yields a quantity of a substance capa- 

 ble of reducing Fehling's copper solution. 



This proteid is probably identical with the j8 casein of 

 Strewe who separated it from a casein (caseinogen) by dissolving 

 out the latter with ammonium hydrate. 



Salts. In addition to the various acids and bases which 

 form part of the caseinogen complex, the serum cf milk contains 

 various salts_in solution. The average percentage of ash in 

 milk is about 6775jper cent but fluctuates considerably. The 

 average composition of the ash of milk, as obtained by igni- 

 tion is given in Table V. 



Table V 

 COMPOSITION OF ASH OF MILK (Richmond) 



Lime 



Magnesia 



Potash 



Soda 



Phosphoric acid . 



Chlorine 



Carbon dioxide. . 

 Sulphuric acid . . 

 Ferric oxide 



Less oxygen = CI 



Per Cent. 



20.27 

 2.80 



28.71 

 6.67 



29.33 



14.00 

 0.97 



Trace 

 0.40 



103.15 

 3.15 



100.00 



Distribution of the phosphoric acid. 



Grams per 100 c.cms. 



PjOfi as caseinogen combined with NaCa . 0605 



P.Os as Ca.PzOg 0.0625 



PzOs as R,HP04 0.0770 



PaOs as RH.PO4 0.0200 



Total 0.2200 



