in the Structure of Calculi. 2^5 
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. 
Animal matter 
8. 
too. 
4. The Rhinoceros. 
The urine of this animal is exceedingly turbid at the time 
it is voided, and when allowed to remain at rest, deposites a 
very large proportion of sediment, which consists of carbonate 
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 
gray 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 - 64. 
Ammoniaco-magnesian phosphate - 30. 
Animal matter - 6 . 
100. 
Sand taken from a dog's bladder was of a gray colour, and 
contained 
Hh 2 
