[ ] 
i pretty well know, and which have hot yet 
obtained any fixed name ; as 1 think it proper 
to wait that event, until this Effay has paffed 
through that trial which I iincerely wifli it de- 
ferves to undergo, equally with others of the 
fame nature. Then only will be tl le proper 
time to fix the genera and fpecies, according 
to fuch charadters as fliaii be found the moft 
natural. 
Meanwhile I flatter myfelf with fo much 
fuccefs, that ftudents, who intend to follow this 
propofed method, will not be fo eafily mif- 
taken in the fubjedls of the mineral kingdom, 
as has happened with me and others in following 
former fyflems ; and I alfo hope to obtain fome 
protedtors againfl thofe who are fo pofTeffed with 
the figuromania^ and fo addiSied to the furface 
of things , that they are fhocked at the boldnefs 
of calling a Marble a Limeftone^ and cf placing 
the Porphyry among fi the Saxa, 
