minerals composing the rock. This plan has the merit of not 

 adding to our confusion, but it will not help us out of it. And 

 ^^'^^" wo re— 1 of ' Phgi-chs- au:;ite olivine mica R-ck,' or of 

 ' Felspar p^i()\(ne in igmtir< giruet Jlock, our patience is well 

 nigli exhausted 



Nitural Science progressis by the comparison of objects, xnd 



purpose, still tor indexing, so tint an observer may reidil_y find 

 desci iptions of simil ir objects foi comparison and tscoitain whit 



studying As books get more and more numcious i uiufoini 

 nomenclature bcconifs of moie md moie import uue fiom the 

 single point of \iew of indexing, xnd until some unitoinut\ m 



mthesubjKt md fuitlior k low ledge will not les^( 



itns shcwm^tlu composition ot thf miteii 

 This, w hu h is tin tin o. v of IJun^en ind Dui 

 iti( d h IS led to oui present cl issitn ition ot 

 1 iLidic rocks , thit IS to i clissihcition toi 

 position llie opposite theoi\ ot >uo\n mc 

 ; bisic md ^ci he rocks are due to Inju itioi 

 lediate composition, also h ids titliei to tin 



^ppirite j;ioup Rut th'^s 1 itt( . method would mimfesth in i 

 rofks into (iifhiinr i,ioui)S ' const -jut nth the estabhshmuit of 



\identl} impossible t 



