CONDENSED MILK 73 



c.c. concentrated ammonium hydroxid, and thor- 

 oughly mix by shaking. 



Add lo c.c. 95 % alcohol and shake thoroughly. 

 Fill up to the level of the side tube with water, if 

 necessary, and shake. Add 25 c.c. ether and 

 shake well for one minute. Add 2 $ c. c. petroleum 

 spirit (b. p. below 65°) and shake well for one 

 minute. 



Allow tube to stand until layers separate 

 well. Draw off ether-fat solution as completely 

 as practicable and run it through a small quick- 

 acting filter into a weighted flask (weighted by 

 counterpoising, if the test is not finished the day 

 it is started.) 



Re-extract the liquid in tube as before with 

 IS c.c. of each of petroleum spirit and ether, 

 shaking after each is added. Before the addition 

 a little alcohol may be added and the contents 

 of the tube mixed by shaking, to bring the layer 

 of ammoniacal liquid close up to the outlet tube, 

 for by repeated extractions the surface of sepa- 

 ration is lowered. 



Run the solution from the second extraction 

 through the filter into the flask, and wash end of 

 spigot, filter paper, and lower surface of the 

 funnel with ether; or, better, with a mixture of 

 equal parts of ether and petroleum spirit which 

 has been allowed to stand for separation of 

 water. 



