Ipecacuanha. 307 



They were made by Rondelet, and published by him in 1802*. 

 They were repubHshed in the works of Gaiithev, edited by 

 Navier in 1809t. 



The specific gravity and resistance of the stones agree exactly 

 with the tables of Rondelet, except in the instance of the pu- 

 mice stone, which differs considerably. It was not to be expected 

 that the resistance of different kinds of stones would be in pro- 

 portion to their specific gravities ; as the resistance of com- 

 pound stones, particularly of the cemented kinds, such as grit or 

 sandstones, must depend on the nature of the cementing material, 

 which is frequently soft and friable ; and conseriuently such stones, 

 however heavy, will crumble in pieces under a moderate pressure. 



The following are selected from Rondelet's work above quoted. 



IPKCACUANMA. 



Messrs. Majcndie and Pelletier have communicated to the 

 Academy of Sciences at Paris an interesting discovery upon ipe- 

 cacuanha. It appears that these gentlemen have succeeded in 

 separating the princijial substance to whicl) the good effects of 

 ipecacuanha in medicine are owing, from those adjuncts which 

 give it that odour and tiiste so disagreeable to invalids. They 

 have named this princi|)al substance hemetinc, A great munber 

 of experiments and observations have been made, which fully 

 confirm the truth of the discovery. 



tome i. liv. i. 



* Traite Tliiorique ct Frucliijue de-VAit tie BAt!, 

 t Oatvra de M, Cuuthei/, tome i. (), 'i^Q el siiiv. 

 U 2 



KXPER- 



