1.24 



baker's north YORKSHIRE. 



THE DRAINAGE DISTRICTS. 



NAME OF THE DISTRICT. 



ITS AREA IN 

 SQUARE MILES. 



65. North West Yorkshire. 





9 West Tees 



190 



8 West Swale 



370 



7* Ure or Yore 



260 



64. Mid West Yorkshire. 





6 Nidd and Wharfe (Ainsty) 

 62. North East Yorkshire. 



84 



5 East Tees 



155 



4 Esk 



3 Derwent ... 



235 

 515 



2 East Swale 



170 



I Ouse and Foss 



Total 



133 



2II2 



Topography of the Plants as illustrative of Facts of Physical 

 Geography. ^The. following appears to be the most natural 

 classification of the plants of North Yorkshire in respect of their 

 geographical relations. 



1. The Montane Species, those plants which- (see the chapter 

 on Climate) are either absolutely restricted to the hills and slopes, 

 or are much more frequent there than in the valleys. 



2. The Xerophilous Species, those plants which (see the chapter 

 on Lithology) are absolutely restricted to or which are much the 

 commonest in the dysgeogenous tracts, growing normally either 

 upon calcareous or basaltic rock or dry ground which these 

 immediately underlie, some of them casually also in dry sandy 

 places elsewhere. 



3. The Maritime Species, those plants which are essentially 

 restricted to the neighbourhood of the sea, and three species are 

 also included here which are normally maritime but which grow 

 also casually in the interior. North Yorkshire is not rich in 



* In Suppl. Flo. Yorks. this is given as belonging to Mid West Yorkshire of the Cybele : 

 but I am informed by Mr. Watson that its proper place is as stated above. 



