By Thomas Bruges Flower, Esq. 121 
northern portion will again be divided into two districts, by tracing 
the highroad from Devizes through Calne and Wootton Basset to 
the Cheltenham railway; the line of which is kept from Minety to 
Tetbury. The southern portion will be divided into three districts. 
The river Avon from the borders of Hampshire traced up to the 
Kennet and Avon Canal near Bishops Cannings, cutting off the 
south-eastern district; and the railway from Salisbury through 
Warminster and Trowbridge to the Kennet and Avon, cutting off 
the south western district. There will consequently be Five leading 
Botanical districts, thus, 
5. North eastern. 2. South western. 
4. North western. 3. Middle. 
1. South eastern. 
All these are tolerably well separated by lines of demarcation, are 
easily found on the land or on the map, and will be quite numerous 
enough for the arrangement of localities, and most other purposes 
of Geographical Botany. More numerous and minute sub-divisions 
have one use, namely, as a means of showing the relative frequency 
of species, by reckoning the number of the small districts in which 
each species occurs. — 
1. Sourm Eastern Disrricr. 
This district comprehends the basin of the Bourne, with the 
whole of the south-eastern portion of the county; its area being 
about 226 square miles. It has the Kennet and Avon canal, from 
Bishops Cannings to Hungerford for its northern boundary; the 
borders of Hampshire furnishing its eastern and southern, and the 
river Avon, traced up from the borders of the county to the Kennet 
and Avon canal, forming its western boundary. Its whole area 
it eretaceous, with the exception, of the outliers of the Tertiaries, (as 
at Silbury Hill and Bedwyn), and of the more regular beds of the 
same deposits in the, south-eastern corner of the county; a good 
example of which occurs at Alderbury, where the cuttings of the 
Southwestern Railway have exposed good sections. This district 
is principally drained by the rivers Avon and Bourne, with their 
tributary streams. The principal eminences are Upavon, Easton, 
