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CLINICAL VETERINARY MEDICINE AND SURGERY. 



urine. As none of these conditions were present in this case, there 

 appeared no reason why a perinaeal fistula should be attended with any 

 of these evils, nor why it should do more than give a dog a short and 

 direct urethra like a bitch. To test this question the following opera- 

 tion was performed experimentally on a dog. Under ether the perinasum 

 was shaved, a catheter passed into the bladder, and an incision made 

 in the long axis of the urethra down to the catheter at the point in 

 the perinaeum where it could be most distinctly felt. A longitudinal 

 incision half an inch long was made towards the scrotum, then bi- 

 furcating in the shape of a Y with the stem towards the anus. The 

 fork of the Y was continued with a slight curve to both sides, extending 

 altogether about two thirds of the way round the urethra, and forming 

 two rounded flaps. These flaps were then stitched to the skin with a 

 fine curved needle and horsehair. Both the result and the method 



Fig. 42. — Prostate of dog. Section of portion of tumour where calcification is in active 

 progress. x about 65. i. Scirrhous structure, fibroid tissue infiltrated with epi- 

 thelioid cells. 2. Calcified part. The calcareous salts are deposited in fine granules 

 in the fibres, the spaces containing cells remaining in the same condition. 



were satisfactory, though it might be better to divide the urethra and 

 dissect half an inch of it up. After the operation a short straight 

 catheter could easily be passed into the bladder ; the flaps united to 

 the skin, and the dog retained its water without difficulty and passed 

 it through the artificial opening. The disease in Mr. Clarke's dog 

 seemed to make very little progress for rather more than two months ; 

 then the animal began to show signs of increased irritation, it passed 

 water more frequently, and could not retain it all night, and finally there 

 was an attack of inflammation, which gave rise to a good deal of pain 

 which was not controlled by sedatives ; so having prepared sterilised 

 dressings, instruments, and ligatures, and having the kind assistance 



