Two sets of anti-carbohydrate antibodies, one with specificity for D-xylose residues of flaxseed polysaccharides and the other with specificity for D-galacturonic acid residues, have been isolated by affinity chromatography from the immune serum of rabbits immunized with a vaccine of the polysaccharides and Freunds complete adjuvant. A number of properties of the antibodies are described. Of special note is the finding that, like other anti-carbohydrate antibodies, the new antibodies are biosynthesized in multi-molecular forms.