238 Geological Survey of Great Britain. 
by the Geological Survey. A glance at the maps suffices 
to establish their excellence. Accuracy of mapping and 
beauty of execution combine to raise them to a grade of per- 
fection which has not been attained in an equal degree by 
any work of a similar character. 
Up to this time, 26 of the larger sheets, of 222 inches in 
height, and some 28, some 33} inches width, have been com- 
pleted, as well as eight quarter sheets. At first the larger 
size was selected for publication, but afterwards the con- 
venience of the smaller form was recognised. They include 
all the south-west of England, with Cornwall, Devonshire, 
Somersetshire, a part of Gloucester and Wiltshire, also the 
counties of Monmouth, Glamorgan, Brecknock, Carmarthen, 
Pembroke, and Radnor, with parts of Montgomery, Shrop- 
shire, and Hereford. They are all engraved on the scale 
of one inch to the English mile, or 1 to 64,000. All the 
sheets can be joined together, a great convenience in use, 
which unfortunately has of late been overlooked in the publi- 
cation of the Maps of our Quarter-Master-General’s Staff, 
which have been divided accorded to the separate provinces. 
* * * * 
Of the geological sections, 17 sheets have hitherto appeared. 
Their scale is 6 inches to a mile, or 1 to 10,666; the colours 
are the same as in the maps. The sea-level is taken as the 
base, and if the observations go below it, they are shewn by 
engraved lines, but not coloured. Numerous notes appended 
to the individual beds give information upon their petrographic 
properties, organic remains, &c. At the same time, the pro- 
bable ancient configuration of the surface, as it would result 
from the direction of the beds, is given in outline; and 
special lines represent the dip of the cleavage which so often 
cuts across the variously-contorted beds in perfectly-parallel 
succession. 
Fifteen sheets of the vertical sections of the strata have 
appeared. They are drawn on a scale of 1 inch to 40 feet, 
or 1 to 480, and are not coloured; the notes appended to 
them contain such an amount of detail as has scarcely been 
yet obtained in any other geological work. 
All the data and results of experience which offered during 
the geological examination of the country, as well as the spe- 
