ASSES' MILK. 63 



oxide of iron ; chlorides of sodium and potassium, and soda in 

 combination with casein. 



The following numbers represent the amount of the various 

 salts found in 1000 parts of milk : the per centage of each con- 

 stituent is added in order to show the slight variation to which 

 the different salts are liable, in relation to the mass of the ash. 



1. Percentage. 2. Percentage. 



Phosphate of lime . . 2-31 47'1 3-44 507 



Phosphate of magnesia . . 0-42 8-6 0-64 9'5 



Phosphate of peroxide of iron . 0-07 1-4 0-07 I'O 



Chloride of potassium . . 1-44 29'4 1-83 27'1 



Chloride of sodium . . 0-24 4-9 0'34 5-0 



Soda 0-42 8-6 0'45 67 



4-90 100-0 677 100-0 ] 



Berzelius 1 found, in skimmed milk : water, 928-75 ; casein, 

 with butter, 26-00; sugar, 35-00; alcohol- extract, with lactic 

 acid and salts, 6-00; chloride of potassium, 1-70; alkaline 

 phosphates, 0-25 ; phosphates of lime and magnesia, with traces 

 of iron, 2*30. The cream consisted of: water, 920; butter, 

 45 ; casein, 35. 



Pfaff and Schwartz^ estimate the fixed salts at 0-3742, 

 scarcely more than half the quantity obtained by Herberger 

 and myself. They contained phosphate of lime, 0-1805 ; phos- 

 phate of magnesia, 0-0170; phosphate of iron, 0-0032; phos- 

 phate of soda, 0-0225; chloride of potassium, 0-1350; and 

 lactate of soda, 0-0115. 



A comparison of my analyses of cow's milk with those of 

 woman's milk will show that the former contains the larger 

 amount of solid constituents, especially of casein, while the 

 latter contains the greater quantity of sugar. 



2. Asses' milk. 



Asses' milk is a tolerably rich white fluid, with a sweeter 

 taste than cow's milk, and occasionally having an acid reaction. 

 Its specific gravity fluctuates between 1035 and 1023. I found 



1 Thierchemie, p. 701. 



a Diss. inaug. sist. nova experira. circ. lact. princip. constit. Kiel, 1833. 



