56 LITHIASIS. 



veterinary surgeon, Furstenberg, who wrote in 1844, about 

 the same time that Professor Morton published his very in- 

 teresting and useful work on " Calculous Concretions." 



Fiirstenberg has shown that there is a wide difference 

 between the urinary calculi of herbivorous and of carnivorous 

 and omnivorous animals. In the herbivorous he found the 

 inorganic compounds of these concretions to be 



1. Carbonate of lime. 



2. Carbonate of magnesia. 



3. Oxalate of lime. 



4. Silicic acid. 



5. Phosphate of lime. 



6. Ammonio-phosphate of 



magnesia. 



7. Sulphate of lime. 



8. Carbonate of iron. 



9. Oxide of iron and manganese. 



In carnivora and herbivora Fiirstenberg found an excess of 



1. Ammonio-phosphate of 



magnesia. 



2. Phosphate of lime. 



3. Carbonate of lime. 



4. Silicic acid. 



5. Oxalate of lime. 



6. Oxide of iron. 



The inorganic principles of urinary deposits in all animals 

 are* mucus, a trace of fat, fibrin, particles of straw, &c. 



In carnivorous animals uric acid and its salts are in excess, 

 as well as cystin. 



Fiirstenberg remarks that the carbonate of lime met with 

 in such enormous quantities in the urinary calculi of herbi- 

 vora is due to the peculiar nature of the food of these animals. 

 Lime is combined with various vegetable acids in many 

 plants, and the carbonate may often be developed in the 

 animal body. 



The carbonate of magnesia is found in much smaller quan- 

 tity in the urinary calculi of herbivora, and the phosphates 

 of the same bone are also comparatively rare in them. The 

 next most important constituent of these concretions in 

 vegetable feeders is the oxalate of lime. Silicates are derived 



