Uronides and saccharides were determined in the ethanol-insoluble residue of some fruits and vegetables, and in the pectin, hemicellulose and cellulose fractions of that residue. For molecular absorption spectrometry of uronides, enzymic, acidic and alkaline extraction were compared. The sugar composition was determined by gas chromatography after enzymic hydrolysis and trifluoroacetic acid (concn. 2 mol/1) or Saeman hydrolysis [sulphuric acid (concn. of H+ 0.8 mol/1 or 2 mol/1)]. Uronide contents found by molecular absorption with m-hydroxydiphenyl and copper binding were of the same order of magnitude. Saccharide composition of samples and fractions varied widely.