144 IV. PHYSICAL GEOGRAPHY. 



above 4000 feet in East Britain ; a larger extent above 

 3000 feet in West Britain. The higher liills of England 

 being situate on the western side of the island, and the 

 highest being in the northern and western counties of 

 Cumberland and Caernarvon, their general tendency is a 

 gradually increasing altitude from east to west. And 

 although the hills in the south-westerly province of the 

 Peninsula are much less elevated than others further 

 northward, they are still nearly double the height of 

 those in the provinces of Thames and Channel ; so that 

 the tendency to increased height westerly is shown even 

 to the most southern of the provinces. The line of Two 

 West Longitude so divides Britain as to place nearly all 

 the high hills on its western side. The ' Scale of Alti- 

 tude,' as given on the Map in volume third, will illustrate 

 the increasing height of the provinces in a northerly di- 

 rection, and likewise the greater height of the westerly 

 provinces, more especially in South Britain. An error 

 occurs in the Scale, in the cones over 18 b and 18 c, which 

 are intended to represent the subprovinces of Orkney and 

 Shetland. The lithographer should have carried these 

 cones one line higher, and drawn them slightly over and 

 slightly under the line of 500 yards, instead of that of 

 400 yards. Perhaps the cone for the province of Hum- 

 ber, no. 10, should also have been a little higher, about 

 midway between the lines of 800 and 900 yards. The 

 altitudes of the Subprovinces may suffice to show also 

 those of the Provinces, in English feet, as underneath : — 



Western. Eastern. 



1011 West Channel. 917 Mid Channel. 



1368 South Peninsula. 858 East Channel. 



1792 Mid Peninsula "2077." 993 South Thames. 



1668 North Peninsula. 904 North Thames. 



1852 South Severn. 905 West Thames. 



1447 Mid Severn. — ? S..uth Ouse. 



