The sample containing oils (1) is placed in the extractor (2) and during operation is gradually engulfed with condensed fresh solvent from the distillation flask (3) and condenser (4). When the liquid in the extractor reaches an overflow level, the siphon (5) transfers the liquid in the extractor back into the distillation flask (3), carrying the extracted finish oils in the liquid. This operation is repeated until complete extraction is achieved.