DISEASES OF THE URINARY ORGANS. 163 
(protractile) portion of the penis, that organ is to be withdrawn from 
its sheath until the nodule is exposed and can be incised. If behind 
the scrotum, the incision must be made in the median line between 
the thighs and directly over the nodule, the skin having been rendered 
tense by the fingers and thumb 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 satisfactorily. Healing will 
be favored by washing 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 bilocular cavity). — 
These are concretions in the sheath, though 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. 
