17G diaries Maclai'cn, Esq., on Grooved and filiated Hacks 



18. Oil sandstone, at Hillhouse Quarry, one mile '■^outh 

 from Linlithgow. 



19. On the shore at Gran ton Pier, nearly one point north 

 of east — (Z)r Fleming). 



20. On Corstorpliine Hill, nearly one point north of east — 

 (^Sir J. Hall) ; also at Ravelston and Craigleith Quarry, seen 

 by myself. 



21. On the north limb of Arthur Seat, 500 feet above the 

 sea — (Z)r Fleming') ; and on the Queen's Drive, south side of 

 the hill. 



23. Westward of Craigmillar Castle, exposed in a quany 

 some years ago. 



24, 25, 26. On Pentland Hills. Few groovings have been 

 found on the Pentland Hills, but those known are interest- 

 ing. I found well-marked striae on the banks of Westwater 

 (ai*row 26), about a mile north from Dunsyre, at an eleva- 

 tion of 800 or 900 feet above the sea. The valley, which was 

 not deep, runs south and north, and the striae crossed it, run- 

 ning exactly east and west. The grooving agent, therefore, 

 did not move downward from the summits of the Pentlands, 

 but ci'ossed one of their southern declivities at an angle of 

 45°, with the direction of the chain. That agent, therefore, 

 could not be a glacier descending from the Pentlands. Ar- 

 row 25 marks the situation of striae near a place called 

 " Thomson's Wa's," and about 1400 feet above the sea. 

 They were seen by Dr Fleming, who described them as run- 

 ning east and west. On a recent visit to the place, 1 could 

 not discover a trace of them ; owing, no doubt, to the blocks 

 of sandstone on which they were, having been removed in 

 quarrying. They were on or near the ridge which consti- 

 tutes the watershed, and about half a mile east from East 

 Cairn Hill, whose height is stated to be 1800 feet. 



Arrow 26. Very distinct striae have been recently exposed 

 about half a mile west from Bonally, where a reservoir is 

 now constructing. Mr Leslie, the engineer who planned the 

 works, obligingly called my attention to them. They occur 

 on the north face of Torduflf Hill, about 30 or 35 feet above 

 the bottom (the real bottom of rock) of the deep and nar- 

 row valley between that hill and Warklaw Hill. The face 



