PREPUTIAL CALCULI. 63 



Until these calculi have attained the sizes just indicated, 

 they endure no inconvenience, but then they cause stranguary. 

 The sheath must be examined, the stones dislodged, and the 

 parts greased with oil or lard. 



Small calculi occasionally form on the hairs growing 

 from the prepuce of the ox, or on the wool of the abdomen of 

 the sheep. These calculi are small, sometimes numerous, and 

 may offer a mechanical impediment to the protrusion of the 

 penis from the prepuce. 



In cattle, these calculi have a specific gravity of 1'325, and 

 contain 



Ammonio-phosphate of magnesia, . . 51*63 

 Oxalate of lime . . . . 1 1 *1 5 



Carbonate of lime 2*40 



Mucus and hairs 2778 



Water and loss ... . 7 '04 



100-00 



The calculi on the wool around the prepuce of sheep have 

 a specific gravity of 1'343, and have been found by Fiir- 

 stenberg to contain 



Ammonio-phosphate of magnesia . . 89 '05 

 Carbonate of lime ..... 3'45 



Organic matter 4 '5 6 



Oxalate of lime (a trace) 



Water 2'94 



100-00 



(f) Gravel By this name a disease is known, which con- 

 sists in the discharge of the material composing calculi, but 

 in the form of sabulous matter. It is a condition that has 

 been especially witnessed amongst horses and pigs, but it 

 may occur in other animals. The deposit is detected in the 



