II 



BUTTER 



149 



Reichert 1 was the inventor of this method, and C. Meissl 2 

 and R. Sendtner 3 modified it. The manner of carrying out the 

 determination is as follows : 



Exactly 5 g. of clear filtered butter fat, which has been well 

 mixed, is weighed out into a round-bottomed flask of about 





FIG. 60. Abbe's Refractometer. 



300 c.c. capacity, and the flask placed upon a boiling water- 

 bath. When the fat has completely melted, 10 c.c. of alcoholic 

 potash (20 g. caustic potash in 100 c.c. 70 per cent, alcohol) are 

 added from a pipette (the liquid should not be blown out), and 

 the whole well shaken. In consequence of the shaking and the 

 warming on the water-bath the greater part of the alcohol 



1 Zeitschriftfuranalyt. Chemie, 1879, Vol. XVIII, p. 68. 



2 Dingier'* Polyt. Journal, Vol. CCXXXIII p. 231. 

 *~Archivfur Hygiene, Vol., VIII, p. 424. 



