GEOLOGY OF THE CAMPSIE HILLS. 25 



ties. It is bounded upon the south by Dunbarton- 

 shire ; and, on the north, by a lowly undulated 

 tract of ground, stretching from the village of 

 Drymen to the town of Stirling, which tract 

 forms the southern part of the river district of 

 the Forth. 



The general surface of the Campsie district, 

 may, in the strictest language, be denominated 

 highly undulated. Its surface majestically por- 

 trays the Bay of Biscay after a western gale, and 

 its high undulations follow each other in regular 

 succession. These undulations are of great length 

 from south to north, and, nearly in that direction, 

 the most of them stretch from side to side of the 

 district. The general contour of these lengthen- 

 ed hills, individually, is somewhat uncommon, al- 

 though not peculiar to that part of the country. 

 Each hill has a considerable degree of curvature, 

 the convex side of which, is uniformly presented 

 to the west : the central part of that curve, forms 

 the highest point of their elevation, and they gra- 

 dually slope towards the extremities of the seg- 

 ments which their curvatures form. Upon their 

 eastern sides, they rise with an equal acclivity of 

 from twenty to thirty degrees ; the rapidity of 

 which, in some degree, diminishes as it approaches 

 the summits, where they are somewhat round- 

 backed. Their central or highest points seldom 

 or ever exceed an elevation of from twelve to fif- 

 teen hundred feet above the level of the sea ; at 

 which height, their western faces very generally 



