LITHOTOMY. 1 25 



urethral dilator pressed into the urethra until the latter is 

 sufficiently large to admit the little finger. This is with- 

 drawn and replaced by a small pair of stone crushing forceps 

 or a lithotrite, which is passed directly on to the stone in the 

 bladder. Care is taken to make sure that the mucous mem- 

 brane of the bladder is not included, and the stone is broken 

 up into small pieces. The pieces are then removed by means 

 of Thompson's evacuator. 



Sewell records one case in which he was able to remove a 

 stone about the size of a hazel nut from the bladder of a bitch 

 without breaking it after enlarging the urethra with a small 

 bistoury. Gray^ has had a similar experience. The after- 

 treatment is the same as already described for the dog. 



1 "Journal of Comparative Pathology and Therapeutics," Vol. X., p. 87. 



