THE MILK OF THE GAMOOSE. 



401 



TABLE CXVII. 



By heating with phenylhydrazine acetate two compounds were 

 formed — one readily soluble in hot water (melting point, 197°), 

 and the second almost insoluble iu hot water, but soluble in hot 

 dilute alcohol (melting point, 218° to 219 ). These compounds 

 agree with phenyllactosazone and its anhydride. 



The acetyl derivative prepared by heating with acetic anhy- 

 dride and anhydrous sodium acetate, and crystallising from 

 alcohol melted at 75° to 80°. When crystallised fi'om a mixture 

 of 90 per cent, alcohol and chloroform it melted at 88 to 0.[)° 



The solution in chloroform was nearly optically inactive : if 

 anything, slightly Isevo-rotatory. 



A determination of acetic acid in the acetyl derivative gave 

 7r46 per cent, as against 70-79 calculated for an oetacetyl 

 derivative. 



The properties of the acetyl derivative auree exactly with 

 octacetyllactose. 



The birotation ratio was found to be r6. 



All the properties without exception agree with those of 

 ordinary milk-sugar. 



It appears that the sugar of the summer milk is '" lactose " 

 and not " tewfikose." 



Wivter and Sinunier Milk. — There appears to be a distinct 

 difference between the winter and summer milks, which may be 

 summarised as follows : — 



Winrei . 

 Fat low in volatile acids. 

 Contains " tewfikose." 



Summer. 

 Fat high in volatile acids. 

 Contains " lactose." 



The author has tried to find evidence that the sugar called 

 '■ tewfikose " was a product of the action of reagents used in the 

 preparation of milk-sugar, but has been unable to do so, many 

 preparations of milk-sugar having been made by the same method 

 (including that from summer milk), always with the properties 

 ^ " 26 



