By Thomas Bruges Flower, Esq. 125 
may also be recognized by the oaks which thrive there, whilst 
on other parts the elm thrives best. Mineral waters occur in this 
formation at Melksham, Holt, and Seend near Devizes.: The two 
former are impregnated with purgative salts, the latter contain 
iron and carbonic acid. This district is principally drained by the 
Bristol Avon, the Isis, Marden, and their tributary streams. 
In addition to the author’s own observations in this district he 
is greatly indebted to the labours of Miss L. Meredith, Dr. R. C. 
Alexander, and Mr. C. E. Broome, whose lists have been kindly 
placed at his disposal. The northern portion of this district also 
has not yet been sufficiently investigated. 
5. Norra Eastern District. 
The north-eastern district is bounded on the north by the adjoin- 
ing county of Gloucestershire, on the east by Berkshire, the 
southern boundary being formed by tracing the Kennet and Avon 
canal at Hungerford to Devizes, and its western by following the 
high road from Devizes through Calne and Wootton Basset to the 
Cheltenham railway, which separates it from the north-western 
district, including an area of 308 square miles. This district in- 
cludes the extensive area of chalk north of the Vale of Pewsey, 
but the rest beyond Swindon is oolitic. There are considerable 
levels of the Kimmeridge and Oxford clays in the neighbourhood 
of Wootton Basset. Broad bands of the coral rag extend from 
Calne, Hilmarton, and Wootton Basset, towards the north-east, 
and these are succeeded by the Cornbrash, Forest marble, &c., &e. 
There are some patches of Tertiary gravels in Savernake Forest 
and Froxfield, north of Hungerford. The principal eminences are 
Charlbury Hill above Little Hinton, Beacon Hill above Liddin eton, 
(690 feet above the level of the sea,) Barbery Hill, Hackpen Hill 
above the Winterbournes, Beacon Down above Heddington, Round- 
away Hill above Devizes, with Easton Hill, St. Anne’s Hill, and 
several others. This district is principally drained by the rivers 
Kennet, Isis, and Avon, together with their tributary streams. 
From the variety of strata occurring in this district, its Flora 
will be found remarkably rich in plants, and, although the author’s 
