3 78 On the Differences in the Structure of Calculi. 



They consist of carbonate of lime and animal matter, 

 which last substance retains the form of the calculus, after 

 it has been acted upon by diluted acids* 

 3. The Sheep. 



A calculus from the kidney of a sheep was composed of 

 Phosphate of lime - 72* 

 Carbonate of lime - 20 s 

 Animal matter - 8* 



100- 



4. The Rhinoceros. 



The urine of this animal is exceedingly turbid at the time 

 it is voided, and, when allowed to remain at rest, deposits 

 a very large proportion of sediment, which consists of car- 

 bonate of lime, with small portions of phosphate of lime 

 and animal matter. 



5. The Dog. 



A large calculus from the bladder of a dog twenty years 

 old, weighing sixteen ounces, was extremely hard, and of 

 a cray colour ; when cut through, it exhibited a nucleus 

 about the size of a hazel nut, partly made up of concentric 

 layers of phosphate of lime, and partly of crystals of the 

 ammoniaco-magnesian phosphate. The part of the stone 

 surrounding the nucleus consisted of 



Phosphate of lime - - 6-4* 



Ammoniaco-magnesian phosphate 30. 

 Animal matter 6. 



100. 



Sand taken from a dog's bladder was of a gray colour,- 



and contained 



Carbonate of lime - 20* 



Phosphate of lime - 80* 



100- 



6. The Hog. 



A calculus from the bladder of this animal weighed nine- 

 teen drachms; it was of a pale gray colour inclining to 

 white, and so hard that it was with difficulty cut through. 



its 



