MILK, BLOOD AND URINE 



213 



acid is present, viz. citric acid, which amounts to about 0.2 

 per cent. The principal salts are chlorides and phosphates of 

 the metals, sodium , potassium , calcium, magnesium and iron. 

 Barthel gives the following for the composition of milk ash 

 according to Fleischmann : ^ 



K2O 



NaaO 



CaO 



MgO 

 Fe203 

 P2O5 

 CI . 



25.71 per cent 

 11.92 per cent 

 24.68 per cent 

 3.12 per cent 

 0.31 per cent 

 21.57 P^r cent 

 16.38 per cent 



Also according to Soldner,^ the same author gives the follow- 

 ing as the salts present in milk- 



Sodium chloride . . . 

 Potassium chloride . . 

 Monopotassium phosphate 

 Dipotassium phosphate 

 Potassium citrate . . 

 Dimagnesium phosphate 

 Magnesium citrate . . 

 Dicalcium phosphate 

 Tricalcium phosphate . 

 Calcium citrate . . . 

 Calcium oxide (in casein) 



10.62 per cent 

 9.16 per cent 



12.77 per cent 

 9.22 per cent 

 5.47 per cent 

 3.71 per cent 

 4.05 per cent 

 7.42 per cent 

 8.90 per cent 



23-55 per cent 

 5.13 per cent 



The salts of milk are in solution, and on evaporation of the milk 

 to dryness and burning the dry residue they remain as an ash. 

 The amount of ash is about 0.7 per cent. The total solids of 

 milk, which include not only salts but also the organic con- 

 stituents, amount to about 13.0 per cent, leaving about 87.0 

 per cent of water. 



1 Fleischmann, "Lehrbuch der Milchwirtschaft," p. 56 (1907). 



2 Soldner, Landw. Vers-Stat., 1888, p. 370. 



