(11) 
CHAPTER 3. 
Colour and Compaciness. 
Tue colour of the Plymouth Limestone varies con- 
siderably, although the prevailing one is a light blue 
or grey, changing at times into a much darker shade, 
or nearly black; these again are frequently inter- 
mixed and marbled with an infinite variety of red 
and other colours: this, joined to its being capable 
of receiving a very high polish, from its hard and 
close-grained nature, renders it of some consequence 
‘to the Stone-cutter, and the Public, for slabs and 
chimney-pieces, many of which require only to be 
seen to be much and deservedly admired. 
