IV. 
passage to the Humber for a large proportion of the drainage ; nor has 
he noticed that the great district of hilly ground on the west of the vale 
of York admits conveniently of subdivision into two large and nearly 
equal portions. 
Thus we have in Yorkshire six principal physical regions, which 
correspond to as many great groups of the subjacent mineral aggregates. 
Several of these may require further subdivision ; as for example, the 
great central Vale, from which the low terrace of magnesian Limestone 
which limits it on the west may be separated. We must also notice the 
line of Sea Coast, and thus we shall have eight Botanical divisions, viz. 
1. The North Western or Mountain Limestone district. 
2. The South Western or Coal district. 
3. The Magnesian Limestone tract. 
4. The great central Vale. 
5. The North Eastern or Oolitic Hills. 
6. The Chalk Wolds or South Eastern Hills. 
7. The district of Holderness. 
8. The Sea Coast. 
The Map will shew the relative position and extent of these districts. 
NORTH-WESTERN DISTRICT. 
External Configuration. — This whole district is of a mountainous 
character ; the greatest elevation is reached in the extreme north-western 
part, where the summit of Mickle Fell attains a height of 2,600 feet 
above the sea. If the summit of drainage be followed between the 
Tees, Swale, Yore and Wharfe, all rivers of Yorkshire flowing east or 
south-east, and the Eden and Lune of Cumberland and Westmoreland, 
we find in succession, on the Yorkshire side, the detached heights of — 
Watercrag, 2,192 feet; Rogan’s Seat, 2,207 feet; Nine Standards, 
2,153 feet; Hugh Seat, 2,330 feet; Ladies’ Pillar, 2,261 feet; Swarth- 
fell, 2,237 feet; Barfell, 2,226 feet; Shunnor Fell, 2,351 feet; Lovely 
Seat, 2,216 feet; Widdal Fell Top, 2,205 feet; Dod Fell, 2,189 feet. 
Connected with this lofty but interrupted chain, is a remarkable group 
of noble mountains about the source of the Ribble, including Wharnside, 
2,414 feet; Ingleborough, 2,384 feet ; and Pennigent, 2,281 feet; to 
which maybe added Great Colm, 2,253 feet; Fountain’s Fell, 2,190 
feet ; and Coska Moor, 2,050 feet. 
