570 MORBID CONCRETIONS. 



7. The Rabbit. Dr Pearson was the first person who examin- 

 ed the urinary calculus of a rabbit. It had a dark-brown colour, 

 was spherical, and about the size of a small nutmeg. It was hard, 

 brittle, and had a specific gravity of 2. It was composed of con- 

 centric lamina?. He found it composed of carbonate of lime and 

 animal matter.* Mr Brande analyzed another urinary calculus 

 of the rabbit in 1808. It was of a dark gray colour, weighed 

 four drachms, and seemed formed of a congeries of smaller cal- 

 culi. Its constituents were. 



Phosphate of lime, . . 39 



Carbonate of lime, . . 42 



Animal matter, . . . 19 



lOOf 



8. The Rat Fourcroy and Vauquelin seem to be the first 

 chemists who examined the urinary calculi of the rat, The spe- 

 cimens which came under their observation were composed, they 

 inform us, of oxalate of lime.| I am not aware of any later 

 analysis of these concretions. 



9. The Rhinoceros. No calculi from the bladder of this ani- 

 mal have been examined. But Mr Brande informs us that the 

 urine of the rhinoceros when voided is very turbid ; and that 

 when allowed to remain at rest it deposits a very large propor- 

 tion of sediment, which consists of carbonate of lime with small 

 portions of phosphate of lime and animal matter. It therefore 

 resembles the urine of the horse. From this there is reason to 

 conclude that the urinary calculi of the rhinoceros must in their 

 constitution resemble those of the horse. 



CHAPTER II. 



GOUTY CONCRETIONS. 



CONCRETIONS occasionally make their appearance in the joints 

 of those persons who have long laboured under gout. From the 

 colour and softness of these concretions they were distinguished 



* Phil. Trans. 1798, p. 15. f Ibid. 1808, p. 236. 



\ Ann. de Mus. d'Hist. Nat, iv. p. 338. Phil. Trans. 1808, p. 234. 



