INDEX. 



465 



Glen Boy, examination of the first hypothesis — a deluge or large 

 torrent ......... 



second hypothesis ; remains of water 



terraces 



third hypothesis — a lake occupy 



ing the valley ........ 



, difficulties attending the third hypothesis 



, position of the boundaries of the supposed lake 375- 



, the third hypothesis the most probable . 374- 



, the level of the sea supposed to be marked by these 



lines . 



Glen Turit, traces of parallel roads in, described 



Glenwhelt, the highest land in England in the parallel from 



Newcastle to Carlisle ....... 



Gneiss, of peculiar character, occurs in the promontory of Sleat 



in Sky 



, transition between it and graywacke and sandstone 1GI- 



Goniometer, common, not calculated to measure crystals with 



perfect accuracy ....... 



, reflecting, measurement of crystals by the . 233- 



Granitic rocks, detached masses of, compose the hill of West 



Down in Devonshire ...... 



Granite, found at Dufton Pike in Westmoreland 



, junction of, with the schist at Cruachan 



, the country near Cruachan appears to consist chiefly of 



, its extent there ...... 



, crowns the summit of Kithill in Devonshire 



, deposit of upon the schist at Cligga point 



Granite veins, penetrate the schist of Cruachan at its junction 



, in slate in the Mourne Mountains 



Gravel, of Litchfield, Mr. Aikin's observations on 

 Greenstone and Slate, group of rocks of, described 

 Graywacke slate, found in the Cheviot hills 



series, transition between it and gneiss in Sky 



Grouan, a Cornish term applied to clay porphyry 



Hangman Hill, height of 



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437 



