770 GENITO-URINARY ORGANS. 



Lund's truss, shown in the illustration (Fig. 325), is perhaps the 

 most efficient of those which survive. The essential portion of this 

 is of metal, and is approximately of the shape of the letter " V." 

 The two ends may be separated and drawn together at will by means 

 of a cord. This apparatus is held in contact with the vulva by 



h'lG. 325. — Lund's truss. 



means of strings which pass through eyes in the metallic triangle 

 and are secured to a collar placed on the neck or to a girth secured 

 round the chest. 



SECTION OF THE SPHINCTER OF THE TEAT. 



This oi^eration is performed to render easily pervious the ends of 

 teats which have undergone contraction as a consequence of changes 

 in the sphincter or from some other cause. 



The animals are secured, and the teat to be operated on having 

 been grasped between the index finger and thumb of the left hand, 

 the point of the little cutting instrument shown in Fig. 326 is intro- 

 duced into the opening of the teat, and it is then thrust in as far 

 as the shoulder on the cutting edges. 



DILATATION OF THE ORIFICE OF THE TEAT. 



The results of the above operation not always proving permanent, 

 and cicatricial contraction often following after a few weeks' time, 



