804 



THE BRITISH ISLES. 



the flykes of lava and beds of scoritic wliieh we now meet in the midst of 

 sedimentary roeks. Ueing; better eapable of resisting destructive agencies 



Fig. 149. — Mount Meiuuck. 

 Scale 1 : 160,000. 



4'35' 



4° 25' w.of c. 



-' Miles. 



than rocks of other formations, the products of this volcanic action still 

 rise here and there into hills and promontories, which impart a pleasing 

 variety to the country. The small range of the Pentland Hills (1,840 feet), 



