BIINERALOGY OF THE PENTLAND HILLS. 181 



How, over which the Logan Water is precipitated. 

 The mode of connection of the individual hills^ 

 varies ; in general they are connected by their 

 summits or their acchvities. 



The principal valleys in this portion of the 

 group, are those of the Logan Water, and of the 

 North Esk river. The Logan Water rises near 

 the foot of the hill named Cock Rig, and runs 

 for about a mile and a half, in a north-eastern di- 

 rection, through the high muirish flat already 

 mentioned, being bounded on the north side by 

 Hare Hill, and on the south side by Spittal Hill 

 and the Kipps, when it falls over a rocky precipice 

 about eighty feet high at Habbie's How, into the 

 delightful pastoral valley already mentioned. It 

 continues its course through the whole extent 6f 

 this valley, which is nearly three miles long, to its 

 further extremity at Castlelaw. The valley is 

 bounded on the north side by Black Hill and Bield 

 Hill ; on the eastern extremity by Castlelaw ; on 

 the south side by Turnhouse Hill, Caernethy and 

 East Side Black Hill ; and its western or upper 

 end, is bounided by the crags arid chffs of Hab< 

 bie's How. Its bottom is very narrow, not being 

 above the sixth part of a mile broad any where in 

 its course. At the base of Castlelaw, the Locran 

 Water changes its direction, and flows in a vary- 

 ing course, but in general in a south-eastern direc- 

 tion, through the hills to Glericross Bridge, where 

 it escapes from the mountain group into the low 

 and liattei country. That portion of the valley 



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