DISEASES OF THE URINARY ORGANS. 141 



The immediate relief is not to be looked upon as a permanent cure, 

 as the calculi in the affected ox are usually numerous and later attacks 

 are therefore to be looked for. Hence it is desirable to fatten and 

 kill such cases after a successful operation. If a breeding animal is 

 too valuable to be killed, he should be subjected to preventive meas- 

 ures, as laid down under "Stone in the kidney," page 136. 



It should be added that when the bladder is filled with a soft magma 

 a catheter may be introduced through the whole length of the urethra, 

 to be employed in pumping water into the bladder. This water is 

 extracted through the same channel when it has been charged with 

 the suspended solids by manipulations of the bladder with the oiled 

 hand introduced through the rectum. 



Calculi, or gravel, in theprepuce, or sheath. — This is usually a collec- 

 tion of gravel, or a soft, putty-like material which causes a distinct 

 swelling of the sheath and gives it a soft, doughy feeling when handled. 

 It may be removed in part by the oiled fingers introduced into the 

 cavity, assisted by manipulation from without, or a tube may be 

 inserted until the end extends behind the collection and water 

 pumped in until the whole mass has been evacuated. Should even 

 this fail of success the sheath may be slit open from its orifice back 

 in the median line below until the offending matter can be reached 

 and removed. In all such cases the interior of the sheath should be 

 finally lubricated with sweet oil or vaseline. It is unnecessary to 

 stitch up the wound made in the sheath. (See "Inflammation of the 

 sheath," p. 149.) 



