Cause.—A thickness or contraction of the mucous membranes lining the teat, or growths inside the teat.

Treatment.—All antiseptic precautions should be carried out in this operation, as boiling the instruments and then covering them with Carbolated Vaseline. Then with a hidden bistoury or a knife concealed in a tube, force upward into the teat, then press out the little blade and draw the instrument down the teat, making about four incisions equal distance apart around the inner surface of the teat. The use of self-retaining teat dilators prevents the contraction of the cut surface. Permit them to remain in the teat for two weeks, removing them only when the milk is being stripped from the teat. Always place them in boiling water and cover with Carbolated Vaseline before inserting.