232 



VETERINARY PATHOLOGY. 



Urates are common in renal tubular calculi, also in cystic calculi 

 of dogs and cats. Carbonates predominate in cystic calculi of 

 the horse and ox. Ammonium-magnesium-phosphate is the prin- 

 cipal compound in cystic calculi of the sheep and hog. Urethral 

 calculi are of the same composition as cystic calculi of the 



Fig. 121. — Group of Calculi, showing a variety of sfiap«^ 



same animal. Preputial calculi are usualK- composed of car- 

 bonates in the horse and of ])hosphiates in the ox and sheep. 

 Uiliary calculi may be composed of carbonates or phosphates, but 

 are more frequently composed of calcium biliverdin. Enteroliths 

 may contain a large nucleus of fecal matter or hair which be- 

 comes permeated and incrusted with calcium or magnesium car- 

 bonates, phosphates, sulphates, or oxalates. Salivary calculi, 



