NOEXHTTMBERLAND AXD DTJEHAM. Ill 



2. English Type. — Species which have their head-quarters in 

 England, especially in the southern proyinces, and become rare 

 and finally cease altogether towards the north. 



3. Scottish Tyioe. — Species which in a manner contrary to 

 those which make up the last type have their head-quarters in 

 Scotland or the North of England, and become rare, and finally 

 cease altogether southward. 



4. Sighland, Type. — The boreal Flora in a more intense degree. 

 Species which have their head-quarters amongst the Scotch High- 

 lands, and are only found southward in the vicinity of elevated 

 mouutains. 



5. Germanic Type. — Species which have their head-quarters 

 in the South-east of England, and run out northward and west- 

 ward. 



6. Atlantic Type. — Species which have their head-quarters in 

 the South-west of England, and run out northward and eastward, 



7. Intermediate Type. — Species which have their head-quar- 

 ters in the South of Scotland and North of England, and run out 

 both northward and southward. 



8. Local Type. — Species too much restricted in their range to 

 fall properly under any of the preceding. 



Explanation of the manner in which the Distribution of Species 

 is stated. — In the enumeration of species we have followed Mr. 

 Watson's list, as given in the fourth volume of the Cylele Bri- 

 tannica, as a standard of nomenclature and species-limitation. 

 As his general and partial numerical summaries are all based 

 upon this list the advantage of adopting it in local works is 

 obvious. Then we give the class of citizenship to which we 

 consider the plant in Northumberland and Durham belongs : 

 then its general type of distribution as just explained. After 

 the word "area" follows the initial letter C, N, D of the vice- 

 county or vice-counties in which the plant occurs, one or all 



