178 



HEALTH AND DISEASE 



organ to its fullest extent. A little flour or meal upon the hand enables 

 one the better to grasp and retain it, as the resistance is not inconsiderable, 

 especially in stallions. The instrument, previously oiled, is then taken in 

 the right hand and carefully introduced into the urethral canal. Provided 

 no obstacle exists, such as a calculus from the bladder, it is advisable to 

 push on with steady but continuous force until that viscus is reached. 

 Should any opposition of the kind indicated be encountered, all effort to 



Fig. 524. —Retention of Urine — Catheter inserted 



A, Catheter, b, Bladder, c, Corpus spongiosum. D, Corpus cavernosum. E, Scrotum. P, Testicle. G, Ureter. 

 H, Kidney. I, Aorta. J, Rectum. K, Anus. L, Prostate gland. M, Colon. 



force the passage should cease, after a fair and reasonable attempt has been 

 made to remove the obstruction. A careful operator will employ an 

 assistant to watch the perineum and lightly press upon the part in order to 

 direct the instrument over the curve of the pelvis, and give it a forward 

 direction towards the bladder. It is important that the nozzle should reach 

 as near as possible the floor of the bladder, so that all the fluid may be 

 drained off; care, however, must be exercised not to injure the organ by 

 forcible contact. 



The stilette is next withdrawn, and a vessel held under the cup-shajjed 

 end of the instrument to receive the fluid. If no solid matters interrupt, 



