242 baker's north YORKSHIRE. 



Colonist and Denizen species, are thus circumstanced. If a row 

 of figures follow the word ' Area ' the species is only known 

 clearly in the districts which the figures indicate. It is only the 

 distribution of Native, Colonist and Denizen species which is 

 indicated as has just been explained; not that of Aliens, and 

 figures are only given where the evidence in favour of the 

 occurrence of a species seems to me of sufficient value to be 

 worthy of acceptance. The drainage districts are indicated by 

 figures as follows, as in the map, and the topographical part of this 

 volume. 



THE DRAINAGE DISTRICTS, 



VicecountiesoftheCybeleBritannica 



Number and Name of District. 



North West Yorkshire 



Mid West Yorkshire (in part) ... 



North East Yorkshire 



Cg West Tees. 

 ■{ 8 West Swale. 

 1.7 Yore. 



6 Nidd and Wharfe. 

 j'5 East Tees. 



4 Esk. 

 ■i 3 Derwent. 



2 East Swale. 

 VI Ouse and Foss. 



Next follows such an account as I am prepared to give 

 of the Vertical Range of the plant within our limits. The 

 species marked Coast-Level, except the Submaritime ones, 

 are those which occur with us only amongst the sand- 

 hills and cliffs of the coast-line. When a couple of numbers are 

 given after the word ' Range ' the first indicates the lower limit, 

 the second the upper limit of the species. All species which 

 descend below loo yards, except a few marked 50, and those 

 which are confined to the coast-line, have their lower limit stated 

 as o, and above 100 yards the liuiits are given in leaps of 50 

 yards. The upper limits above 100 yards are also given in leaps 

 of 50 yards. Where one number only is given the ascertained 

 vertical range of the species is under 50 yards, and that number 



