The intrinsic viscosity of ovomucin (B) from the thick white was higher than that of the thin white. The relative area of the fast moving component in the electrophoretic pattern of ovomucin (B) from the thick white was about twice that of the thin white. The hexose, hexosamine and sialic acid contents of ovomucin (B) from the thick white were higher than those of the thin white. The intrinsic viscosity and carbohydrate content of ovomucin from the egg white previously freed from lysozyme were low in comparison with those of ovomucin (B). The carbohydrate contents of crude lysozyme from the thick white were higher than those of the thin white, and crude lysozyme obtained from the thick white contained larger amounts of ovomucin-like material than the thin white. From these results, discussion were made about the relation between the properties of ovomucin (B) and ovomucin-lysozyme interaction.