2. English Type.—Species which have their head-quarters in England, especially in the southern provinces, and become rare and finally cease altogether towards the north.
3. Scottish Type.—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. Highland Type.—The boreal Elora in a more intense degree. Species which have their head-quarters amongst the Scotch Highlands, and are only found southward in the vicinity of elevated mountains.
5. Germanic Type.—Species which have their head-quarters in the South-east of England, and run out northward and westward.
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-quarters 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 Cybele Britannica, 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
