tainiMf h 

 name ol zeo- 



As. these experinieiits bad b^eji undevtakennipre for ,the 

 purpose of ascertaniing the nature af the component parts 

 of this zeolite than their proportions, the object of them was 

 conbidk'ied as accomplished, although perfect accuracy in 

 the latter reapect had not been attained, and which, indeed, 

 ♦he Jinslysis we possess of natrolite by the illustrious chemist 

 of Berlin renders unnecessa'y. >»■ 



Reasonsfor re- I am ino'uced to prefer4;he name of zeolite for this spe- 

 cies of stone, to any other name, from an unwillingness to 

 obliterate entirely from the nomenclature of mineralogy, 

 while arbitrary names are retained in it, all trace of one of 

 the discoveries of the greatest n)iiieralogist who has yet ap- 

 peared ; and which, at the time it was made, was considered 

 CH,aud was, a very considerable one, being the first addition 

 of an earthy species, made by scientific means, to those es- 

 tablished immemorially by miners and lapidaries, and hence 

 having, with tungsten and nickel, led the way to the great 

 and brilliant extension, which mineralogy has since re- 

 ceived. And, of the several substances, which, from the 

 Btate of science in his time, certain common qualities in- 

 duced Baron Cronstedt to associate together uwder the name 

 of zeolite ; it is this which has been most immediately un- 

 derstood as such, and the qualities of which have been as- 

 sumed as the characterislic ones of the species. 

 Names given Indeed, I think, that the name imposed on a substance 

 should run be ^^ ^^*^ discoverer of it ought to be held in some degree sa- 

 alieied. cred, and not altered without the most urgent necessity for 



doing it. It is but a feeble and just retribution of respect 

 for the service, whicli he has rendered to science. 

 Existence of Professor Struve, of Lausanne, whose skill in mineralogy 



phosphoric j^ ^j.]j i^nown, having mentioned to me, in one of his letters, 



acid suspected , - *' . ... ' , 



in it, but none that, from some experiments of his own, he was led to s.us- 



jbund. pg^.^ ij^g existence of phosphoric acid in several stones, and 



particularly in i!'e ze'olite of Auvergne, I have directed my 



inquiries to this]jjoint, but have not found the p)iosphoric, 



or any other ^ickriowledged mineral acid, iti this zeolite. 



Jsquartaan Many prrson3, from experiencing much difficulty in 



cotpprehendinj; the coznbination together of the ^jths, 



have been led to suppose the existence of undiscovered 



acida in stony crj'fj^il?. \i qMQ.rt?? b? itself <:onsidej:^d ^§ ^n 



acid. 



»ndi 



