42 



these movcrrimti since I heir consolidation; The first hurried view of a portion of the mmw 

 at the rparries It ft tbo impression I hut the rock* had been (hollered add separated by such 

 forces. But I am now satisfied that, with some slight rice [i l Tons due to decom position and 

 consequent alteration in the balance of the different part* of seme of (he Larger rocks t 

 they all occupy their original relative poaUitiiis, and cirri their original ubsolulc potions 

 wilb reference to iho horisonj although the level of fhe whole Island and adjacent tract 

 has probably shifted. At all events no violent vilbratory movement hns affected the Island 

 since ihe joint* were formed and the mast stood above I he surrounding (tact. I cannot 

 think that a ware of newer adequate for the cicavation of fhe rhannrU could have been 

 generated by a movement whirli would have left the projeclin^ rocks undisturbed t or even 

 that the force of the wave itself could have met wtlli Hurh rcrisiaiir.c from the smaller 

 rocks as to cftiblc H to grove ihe channels instead of displacing the rocks. No doubt a 

 large proportion of these rocks were formerly firmly wedged TOlo the mas* of the Island f 

 but ruanv must hare been more or less isolated, as the cliannch embrace more than 



4 1 



one tftfe. The undulations, if BUY, attending \\\\ H^y:j|loh nf [he Umid nnd imbuing waves 

 of translation, (if they were sufficiently violent ! and the upheavals sufficiently ftrent) would 

 probably bo in the direction of the Peninsula * arid, □flrr the Island and ihe adjacent 

 bills of Sintfnpnrt and the rnaHnland ro*e above the sea,, wares might act on bolb sides of 

 ihe Inland Iraiisverricly to the line of ufirkilafion, But jis the principal fissure* and soft 

 bands are in ihe same direction j the circumstance of the grooves mostly coinciding with it 

 doe* net peculiarly favour the application or the wave: theory. But in rejecting lu applicabili^ 

 we niajj at the name time , allow that ihe oclion of the waves r whether ordinary or eitra- 

 ordinary; as the Island ijradu&VlVj or by abrupt steps f rase above the sea., may have as- 

 sisted to a corMderabh; decree both chemically and mechanically in wearing the channels, 

 On iho coast of SintfApQftt upposik- iht antem ci! re/nity of Pah ffMkj, and only a mile 

 distant f Ihe re is a layer of pebbles evidently marking Ihe fast flvp in the elevation of the 

 land, Such pebbles driven to and fro by the whycs against the rocky beach of Pute Uiin 

 would be icsEnjircmial in deepening hollows, 



Since a portion of t his paper was written I bate seen , in the number of the Quarterly 

 Journal of the Geological Society of Lend&n for May East, in the Presidents annual address 

 to the Society , a notice of the observations made un (he coasts of Swetlm and ftorirpy f 

 last year t by M . IhricGniau M. Duaoonu found along a portion of the coast , and par- 

 ticularly in the Islands olT it, deep channels and furrows in directions from WW. to 

 SE.j some 10 to SO inches wide end ft to Hi feet deep, > effects of erosion/' fcayn the 

 President j t on a much greater scale than I remember to have read or before. 11 The re- 

 semblance of these channel to those of Pulo Uhin is not confined to their unusual file t 

 but is carried out in ihe circumstance of the sides of the interiour of many of the channels 

 being grooved in the directions of their longer axes, of their sometimes diviHiojj into two 



if*9t i I but ilriidT Hid . ji probiUj bat * mill wttion cf * vtit r*gi»nu rmhrmc'\n$ fndU ao Iht an lidi md 

 JwtifAli* on Ifat eibar >■ wbiea tUuiLftf (Wen nvr* in ■clivilj Jurlnfl lh« |ihd yaw\ud f ft is J pi uilnrtJ *i™iJ*/ *fl"*eU 



