5S 



Wo hare ate ii that Tflfl BuuJt refer* these beds to cent rue Lion of the su balance of the gratiite 

 jiE ei linftc when it had a degree of caruii-isiocc * which in mest caw* wu* fur tenioffcd from, the 

 cojadjtiofi ti( fluidity,," But may not Uio internal structure of granite and other hypofjene tucka 

 be- primarily due t not to the merely mechanical effect of coat rati ion mi cioolinj*, but to 4he urifliwd 

 eojusiilions- of eryitaUhntion ? Kuvcnin^ f lic Neptunian theory q[ iLc deposition of the primary 

 rock* from a slate of chemical solution in a hat fluid upon the u/^-r gurfcee of l be earth V 

 eru*l r may or rather mmt we noi conceive them lo hava bena gradually deposited on the 

 tintltr surface of the croft? We must suppose that crystallisation did not at once extend 

 tUreujjhouii the whole el any ma** of pi u tome fluid , but comim-nccd in a layer nearest the 

 rcrrijjcralui^ surface of the super Encumbent rock*, and thence slowly extended by nrjcrctiun* 

 Fr»m txitW, Dr. Lar^ek says tliat & sudden cxpauiiuft in frrtaiaa^ 1 ii parUctihiriy eosi- 

 *pjcuons jci Mil: crystallization of *olids which shoot into prismatic fornix The process of 

 crystal I i tat ion in laboratories u for t!iw reason frequently attended with ihc fracture pf (he 

 Tvv.sc ]h lcj which it is uouiiucteJ. It may be taken as a genera 1 truth , to which however 

 there; miy probably be some WBjpfL^u* , iJui bodies which fTy*talliiu ta fr^eri/ir/ uuder^a 

 I he sudden etpansiou. here mentioned , and thai Vwiies which dp not cry* tall iie in freezing 

 for the TiiDr&L port tulTVr a. sudden contraction 11 03' ^ priori t therefore, it vnifthl be pre- 

 dkated as probable that the fjraiiilfc fluid, like miter, expands on congelation, Thi* pre- 

 dicaliou seem* to toe verified by okscrved phenomena, Jf I fie. jj, rani fa contracted on crystalli- 

 ■'.siU-i, . I he cryiiflis formed ol ami near the surface of refrigeration would sink , the hot 

 fluid from below would constantly ascend lo ihe turfec > und when the central hc^t of the 

 I rrtli was m murli lowcn cl lis lo allow the crystals to reach the centre of gravity in o solid state, a 

 flttctalis Would there be formed which would gradually increase until the rjtolbc: was talidi- 

 lied From the centre tu the circumference \ or, at all ercnl*, no permanent solidification 

 would ukc place until the temperature of the vhate fluid was reduced to flic point of 

 eanfehilioii (12). Under tueh conditions , if the globe were criminally a homogcii^mi* Uuid , 



mmWrr in diH'urnt ihap-ri „ and wh\c\i ■ □ a flan bm ^'I- 1 i firf -ti mI stifiriB pPacmpi in Iba plkflii r>iB<m wbioh ft* 

 ■oil fr<oA Ibu. Wd mmy 14 pif(ieu]v prantMi . Kb Uid aitvp of ■ uob inn * Ibuuij ikfen. Ibfria 



vittnit I Ko-i r cialaAif* d^fakrvioii * bnl 4.cill fchp EnifiiitNi af n»tur« wart (4f »Lb«r ind in birracinr ■ or rallwf 

 m L'h^ unity cf |b# alkEabio iliH BiEiiiifotL ifci^lf. W« lerni iflnn« rants* pin ton i« anrl 14HV» T*Jflaiijfl s Bdd 



praiiiiMj am ar* fofCiii ta iat tliaL Llvr pUi by lAfeMtlibLt gridtLianl intu «nc'ii olhrT. A ■ aur \n»7rUA^m rlttli&i 

 hit i iL.ii [.j-nhalblr tppthr bnl % ptiy af w&i'dt, HaiLraininii tptcutjtinfl , we taij c-d ii J*r JL n rilibtiihtid 

 rbil 111* plulania ind Tclmni^ r««lci mrm- tho prWiw of Ebi uni pracen ; Ihtt cianjalalj^n And ^kpa^tlien tkm> 

 ■lik* cinis lb* itf fctififil iimstwHj *nd lb*l q ebamioal 4cNon ■ cU*n §hf(l\t ■ i^ucitii ndi rraj R in iilir, 

 lrn«oifi* ■•liiti jliltJ tfl indimniilar r p antt indinninlir y rocki may ■ in ll'/ri h becama auimilaL^iI lo k^nroiki. Oba*r- 

 Tailfln llfn* Mn ra^onitrgct I bp biitorj af "rvV nivea rotb. , ami A*Ufmit\* <ba limilt Uri|birt WaLcll Ui azii mMti t iaR* 

 ■rp i* I in hd'.i. r. 



f 1 1 JVf a/jj* mi Huf » p. 131. 



|2> Thii fipr-eir* In pgrantl« (fl l< ibflpt llin »jaa ai tliat of faff f &» Ul Itactii'i Jt apart f- l&l) vbiah ■■ aUbt<| 

 In lli,- Uhla ■pphinlni la Hp. L4Ihfbh. 1 i Trtatiit an jE/««| (p r 415) la fan 21631* f. kai vmieb nppran faj f^i 

 imprnrip-il prrfliaol^r of PrqfiriEar OuiiLl la tin anlj- "ilK!! 1, F- f P*""jp f7^cplirwtf§M\ frifji'i,^ a irdf wiwliin^ 



Fqinii.i II ikantd fa* abi^r^ed. ba^Bi^fr Ibal kjmnilfla rmrj nrj ijrriBtlj in fnilbiljlj. Trapprnn raekiE Tirnri fo-UliJ 

 far &fr H- Lk BlCltn to fuio a I I be inine IcfapiaraliLra wkb ixipp«r or P. 



