NATURAL HISTORY. 
have a bolder, and more massive character than 
most of the other Torrs, so numerously scattered 
over this exposed region. Some of these latter, 
have very broken and picturesque outlines, often 
bearing a close resemblance to extensive castellated 
ruins, as may be instanced in Hounter Torr, and 
one or two others in the immediate neighbourhood 
ef Hightor, to the N. W. They ali consist of 
rhomboidal masses of various sizes, (the whole 
formation indeed has a similar structure in the mass, 
as may be observed in the Quarries, immediately 
under the High Torr rocks,) mere or less rounded 
at the edges, and separated from each other by the 
action of the atmosphere, The Logan stones, that 
have been noted in various parts of the granite dis- 
trict, owe their origin to this cause; and hence 
different blocks become more or less perfect ones, 
or gradually cease to be so, and fall from the base, 
There isa large rocking stone at Lustleigh Cleve, 
three or four miles north of High Torr, the only one 
we are acquainted with in the district. Those cir- 
cular cavities that occur on the summits of many of 
the Torrs, and have been termed Druidical basins, 
have their origin in the same natural causes. There 
are three or four very distinct ones on the Hightor 
rocks, Detached blocks, of various sizes, are 
thickly strewed over the surface, in different parts 
of the district. 
The component parts of this formation, are prin- 
cipally felspar, quartz, and mica, in grains, or 
crystals, of various magnitude, and more or less 
