A description is given of an all‐glass, high‐vacuum (10−5 to 10−6 mm.) laboratory apparatus, to be used for the quantitative recovery of volatile constituents from oils and fats.Up to 1 kg. of oil can be treated per day. To prevent decomposition of the oil, only moderately elevated temperatures are used. The distillate obtained can be transferred quantitatively to chromatographic columns.Model experiments are described to show the efficiency of the degassing and the factors involved.