USh 



NEW fPEClES OF URUNART CALCVLtlS* 



Jftw «pecies of 

 acune in the 

 bladder. 



Five kinds lie- 

 fore described 

 by the amthor. 



Another spe- 

 cies since dis- 

 cevered. 



Terjr rare. 



VIII. 



On Cystic Oxide, m new Species of Urinary CalcuJuit> B^i« 

 William Hyde Wollaston, il/. D. Sec. R. S.^ < 



JL HE principal design of the present essay is to malte 

 known the existence, and to describe the leading properties 

 of a new species of urinary calculus from the human blad* 

 der; but I shall at the same time take the opportunity of 

 correcting an inaccuracy or two, that I have observed in 

 my formier communication on this subject. (Phil. Trans. 

 1797.) 



I, on that occasion, took notice of five kinds of urinary 

 calculi, 



1. The Hthic acid, since called uric acid, originally ana- 



lysed by Scheele. 



2. The oxalate of lime, or mulberry calculus. 



3. The phosphate of lime, or bone earth calculus* 



4. The ammoniacal phosphate of magnesia. 



5. The fusible calculus, which consists of the two last spe- 



cies combined. 

 It is now about five years since I first met with anotlier 

 species, evidently differing from each of those before de- 

 scribed. It was in the possession of Dr. Reeve of Norwich, 

 who obligingly gave me a portion of it for the purpose of 

 examining its chemical qualities. It had been taken from 

 his brother when he was five years old, and at that time was 

 covered with a coating of phosphate of lime very loose in 

 its texture, and consequently very soon separatedf. This 

 species is probably very rare: for, although 1 have omitted 

 no opportunity of paying attention to any urinary concre- 

 tions to which I could have access, I have, to this time, seen 



♦Phil. Trans, for 1810, p, 223. 



^ . , + I ara informed, that another stone formed afterward In the bladder 



Stone with a ,'.^ ,iujj- •,_ ... 



hollow centre. ^^ '^^^ ^^* ^"'^ ^^^"^^ he died m consequence, without submitting to the 

 operation a second time. The stone found in his bladder after death 

 consisted principally of uric acid, but was peculiar in one respect, as its 

 centre -vras hollow by the removal of some more ^olable substance, ot- 

 Which the nucleus had consi5ted. 



only 



