CONDENSED MILK 73 
c.c. concentrated ammonium hydroxid, and thor- 
oughly mix by shaking. 
Add 1oc.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 wellforoneminute. Add 25 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 ascompletely 
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 
15 c.c. of each of petroleum spirit and ether, 
shaking after eachisadded. 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. 
