HUMAX MILK. 



397 



were from 0'85 to 2 "22 per cent, below the difference, and averaged 

 I "30 per cent, below. 



It was noted that by precipitating the sugar crystallised from 

 water with dUute alcohol an amorphous substance separated, 

 soluble in water. The [a]j, of the organic solids of the mother 

 liquor from which the sugar was crystallised was 26 "8°. These 

 facts seem to indicate that more than one sugar was present. 



Proteins. — The proteins differ from those of cow's milk by not 

 giving a CTird with rennet, and by giving a much finer precipi- 

 tate with acids. By the addition of calcium phosphate they 

 can be made to approach much more nearly in behaviour to 

 those of cow's milk. The proteins of human milk are not 

 precipitated by copper sulphate from a solution neutral to 

 phenolphthalein, but require a further addition of alkali ; the 

 precipitate thus obtained yields a black ash, while the proteins 

 of cow's milk precipitated from a neutral solution leave a green 

 ash. 



Mineral Matter. — Harrington and Kinnicutt give the fol- 

 lowing mean composition of the ash : — 



TABLE CXIII. 



Uncombined carbon, 



Chlorine, CI, . 



Sulphurous acid, SO.,, 



Phosphoric acid, P..Or„ 



Silica, SiOj, . 



Carbonic acid, CO2, 



Iron oxide and alumina, (FcAlj.O;, 



Lime, ..... 



Magnesia, 



Potash, ..... 



Soda, 



Less oxygen = chlorine, 



Per cent. 



0-71 

 20-11 

 4-38* 



1(1-73 

 (l-7(( 

 7-07 

 U-40 



i:.-ll!t 



]-n-2 



29-84t 

 ]2-3!1t 



104-851 

 4-53 



100-311: 



The presence of citric acid has been established, and is about 

 O'l per cent. 



Bechamp describes a starch-hydrolysing enzyme. The author 

 has established the presence of a proteolysing enzyme analogous 

 to that described by Babcock and Russell in cow's milk. 



The Milk of the Buffalo. — This has been examined in Europe 

 by F. Strohmer, W. Fleischmann, A. Pizzi, and D'Alzac. 



* Given in original as sulphur, 219. 



t Given in original as potassium, 24-77 ; sodium, 9-19 ; oxygen, 6-16. 



j The total is given in original as 100-54. 



