affording an additional variety of soil.
From the abrupt termination of the Hogs
Back at Guildford, the northern boundary
is continued along to Merrow Downs:
from thence the eastern boundary passes
by St. Marthas Chapel, and crossing the
valley of Chilworth by the powder mills, it
skirts Blackheath to Shumeley Green, is
continued across the Wey and Arun canal
to the junction of the Cranley and Horsham
turnpike roads, and follows the latter to Pains
Hill.
  The southern boundary is taken hence
in a westerly direction through the weal-
den clay, immediately at the base of the lofty
range of hills commencing at Hascomb Beech,
and terminating at Bowler Green near Hind-
head. From this point the western bound-
ary is formed by an imaginary line
through Cosford crossing Thursley common
to Elstead, and continued thence over Crooks-
bury and Puttenham Common by Hampton
Lodge, passing over the Hogs Back near
Shoeland Farm to the commencement of
the northern boundary.
Geological Features of the District
In noticing these I commence with
the northern limit, which is a termination
of the London Clay resting upon the chalk.
I am not aware that any portion of the
plastic clay is to be found within the
limits: the Bagshot sand, which is so
conspicuous, does not approach