37 



jifjouj to the divisional planes which nl ike penetrate plutonie reefcs and the strata above them 

 TjiiinUy in directions approaching tovcrticol, and which nlto qiist in {pieisSj but lo those beds 

 in pranite which vo* Been considers as always conforming to Ihe external surface of the 

 nrantlic babble., of whatever form that may Lc, and which Sir IJ\ as 14 Biens describes at 

 bcinfj- in Devonshire and Cornwall actually parallel to the strata of superjacent sedimentary 

 rocks where the pfaoc of contact rati be seen (1) P 



for it WOQld dritf oy the [oelemorpliifl theory alio* Th# TVffi/ifi On Giofapy wai pnbUihed in * and the 



eecend edition of >|r P Lt I ll* EJruruti in ISlI f bat ila noticing t40l objection! In I hi metainorphic theory Mr. 

 Lull doea not allude to Proftetor Fbilum 1 argument* It it I* be preiumed therefore that he diiereditt the 

 fact en which it rut* f tad ai 1 do .not &nt! it racnlioncd by Frof. Jixiao* . who but itudied gneiu carefully, 

 nor by other iriicn , we mini wait for further investigation, Proffltior Jjweiot. ou Ibe <!0n.tf*j-jp io UriaiT'i 

 Enzytfopatdia %f Gwgrtphj published in 1811 {p, 2I0J peittiTely a(alce that the coOCTohon* of limntone F ^neiii , 

 raif* - tlili ether reeki of * fc ^ primiliVe cleft bare * *eme ebareotere n thoie of grenitfl h e. a they ere joined 

 iofl ether wrtheni any ubjii or gretind r ind it their lino cf ju net are ure either elotely alteebed toe; ether or art 

 intermixed *ad frequeally brapehei of I La one concretion ebeet into lb* otter or the concretion 1 mulmltj in- 

 prtu etch ether. 



(I) The eludy of plulonie rod* end of mineralogy nppeure to hare been tome what neg Footed by geotogiala of the 

 EngWih nthoel . and. making duo allows nee for Ihe Influence of Waaieaw Ibeoriei ► 1 thoald be drcpoied lo fire 

 much weight to the inferencea of (be Scollilb jgeologi'jfti who, AflinatfJ bj the ardour lint kindSed *l[Frvy&erg. 

 darrffg mwy jein ^borionrrj end minutotj exptor^d tb& niDUnteini r coAit* end! 11 Tin eft ef (beir neliTe <ouolry. 

 Ctnciit ii Jargeij deteloped in lbs norlb of Srettunrf and frequently aiiociattd with granite . and tbr annJo^T t>e- 

 l«ean lh?a muit be Tery itreng lo admit of Profenor JiMaiot d Entering tbat »■ gran lie necurt in mtutti . nflen 

 many mii]ci in eafcnt , turr Blinded by grjaiti . mitl - ittte P Juad eUj -alale* and ao oonnecleJ fritb Ibeia PWfcti 

 that the wbote may be eoniiderad ee tba romtt of en* grand proc«i» ef eryiudlUnlinn ; that ii . the granite ii of 

 eoAlentporaneons formation wilh tbe gneln at the gfifrtia tl with Ibe luprr * impoird mica ■ ilato , and tba rnic* - llete 

 again vilb tne «latr-tlale *hi<rb real Upon it. /ft of^er rpralajTrrl /Aj gritftit* aiitWGte* in Mm, offtn of tHOr- 

 nom wn^Bi'faci'* . with gntti* , «±Va - j/flf* . efaf - §l*t* , fl«J ofA^r primitive rat fit t or ii trafoftee (beie tn 

 lb* form of reine." Again » »grenile im lomatiuiet diipoied in great hcdl in p*i*i a«d &lb*r rooka, and occa- 

 sion alt I 1 tbeae hcdi appear di Tided int& air at a. In olber inatancei , in granite aountatne we enter fe betide* UlS 

 tabulur * gtobalnr and otaer ilryetur*i P nlio tbe at rati fled ; bat thlt Uttir ia ■ in general, leai pirfeet I ban whit 

 ii obatrted in gne'na anil otber rorAf 11 . It If true Pfofeiior JxHaaOl then believed in the W*r*t*rtan thfory 

 (wbkh b* haa ikice HuR^'r abandoned , for in bit latoit 4ie*aineatien be dlilributei tbe hjpagena roeka into Plu- 

 tonian and Neptunian} but b* would not miarepTeaenit facta , and the fact* wlueh be ebierved in Scotland leemrd 

 tu him te Jemonalrato the derivation ef granite and gneii from a common origin, flow (hi i conctueien it qai(4 

 ■eparabl* from tbe alter ionr ipteuLation at lo lb? nature of the origin . end in tbe preaenl advanced alale of oHr 

 knewtedf e it eeeoia le require n* Lo nubiLitm* .1 plutonie for an aqueon* r withe at tba inlarvtntion of Ibe m e t am o r - 

 phie 1 theory. Let me not be understood however ai deairona of eoabraeina; a direct plalonic tbeory in tbe place 

 of (bp metamarpbic. All I nutnleia la {bat tfa#r« la a limit where H ceaaei to bo a theory and beconu* an. kype- 

 I'n-vi, and tbi* limit n narrow cam pare & wjlb ( art rait prof i nee or*r which ila leading eapeneflle eat and ik 1* 

 qn bjpetheiia it ia highly valuable . bating already guided inreiligaliena which have been rich in rei uUi* lit le- 

 gitimato domain, ef which the boundariea are deHned by geological demona Ira lien * m eenalanlly enlarging; and, 

 in tbt prrienl palmy cond.it ten of the iMenca t WO may hope lba| g* e-tegiata + in a few yewe « will be able lo 

 determine whether tbe bulk ef wkal are termed tbe primary or aypofeae atnlilied recke be aeni - plulonic (L ** 

 motamorphie) or en I ire ly plutobie . in Ihe Mm* aenae in which graeit* ia, 



At (ha preifnl day it ia loot ia much rlogmatiim + prejudice or a rCckleit ipirit (■[ r prrijUti^n in men* (bat matbtaint 

 rirel (beeriet in gcetegy , nt that higher me I amorphic power ef nature whiob it ever reproducing tbe elemenli of 



