154 



MILK 



INDICES OF REFRACTION («d) CORRESPONDING TO SCALE READINGS OF 

 THE WOLLNY MILK.-FAT REFRACTOMETER— (CoK««««ii). 



The standard alkali solution used in the Wollny refractometer 

 method is prepared as follows: 800 grams KOH are dissolved in 

 1000 c.c. of water, and after coohng 600 grams glycerin and 200 

 grams pulverized copper hydrate dissolved. The volume of the 

 solution is made up to 3000 c.c. with water and allowed to stand 



