EXTRACTION WITH SOXHLETS APPARATUS 21 



extracted fat, negligible in the case of a substance such 

 as linseed, might lead to a \^x%^ percentage error. 



When the extraction is complete, the burners are 

 turned out, the cartridge and its contents removed, 



ir^' 



Fig. 4. — Soxhlet extraction 

 apparatus. 



Fig. 5. — Apparatus for extraction 

 with volatile solvents. 



the extractor and condenser again fitted, and the latter 

 heated on the water-bath until all the ether has been 

 distilled over into the upper part of the apparatus. 



The last traces of ether are driven off by placing the 

 flask for a short time in a steam oven. The flask is 



B 2 



