DISEASES OF TIFK UHINAHV ORCANS. 163 



(protractile) portion of the penis, tliat orj^aii is to be withdrawn from 

 its sheatli until the nodule is exposed and can be incised. If behind 

 the scrotum, the incision must be made in the median line between 

 the thi<j:hs and directly over the nodule, the skin havin<2^ been rendered 

 tense by the lingers and tliunib of the left hand. If the stone has 

 been arrested in the intrapelvic portion of the urethra, the incision 

 must be made beneath the anus and the calculus extracted with for- 

 ceps, as in stone in the bladder. The wound in the urethra may be 

 stitched up, and usually heals slowly but satisfactt)rily. Healing will 

 be favored by washiuf]!: two or three times daily with a solution of a 

 teaspoonful of carbolic acid in a pint of water. 



Preputial calculus (calculus in the sheath^ or hilocular cavity). — 

 These are concretions in the sheath, thou*;h the term has been also 

 applied to the nodule of sebaceous matter which accumulates in the 

 blind pouches (bilocular cavity) by the sides of the papilla on the 

 end of the penis. Within the sheath the concretion may be a soft, 

 cheesy-like sebaceous matter, or a genuine calculus of carbonate, 

 oxalate, phosphate and sulphate of lime, carbonate of magnesia, and 

 organic matter. These are easily removed with the fingers, after 

 which the sheath should be washed out with castile soap and warm 

 water and smeared with sweet oil. 



