[ xxi ] 



I pretty well know, and which have not yet 

 obtained any fixed name -, as 1 think it propel? 

 to wait that event, until this Effay has palled 

 through that trial which I fincerely wifli it de- 

 fences to undergo, equally with others of the 

 fame nature. Then only will be the proper 

 time to fix the genera and ipecies, according 

 to fuch characters as fhall be found the mcft 

 natural. 



Meanwhile I flatter myfelf with fo much 

 fuccefs, that ftudents, who intend to follow this 

 propofed method, will not be fo eafily mis- 

 taken in the fubjects of the mineral kingdom, 

 as has happened with me and others in following 

 former fyftems ; and I alfo hope to obtain feme 

 protectors againft thofe who are fo pofferTed with 

 the figuromanid) and fo addicted to the furface 

 of things, that they are (hocked at the boldnefs 

 of calling a Marble a Lime/lone^ and of placing 

 the Porphyry among ft the Saxa. 



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