94 BASALTIC WOSdERS. 
siderable size when compared wUh the height of 
Giant's Causeway. The columns of the Vene^*‘ j,". 
display, however, all the varieties of prismatic 
are observable in those of the latter, and other liid 
They are usually of five, six, or seven sides j 
agonal form seems chiefly to prevail. / 
The texture and quality of these columns 
difterent than their forms. Those of the 
volo present a sraootli surface, and, when 
within of a dark iron-grey colour, manifesting 
solid and uniform texture ; in which characters > 
•.! .1 . __i _r r>‘. 
respond with the columns of the Giant’s 
those of most otlier basaltic groups. But Are ^ 
% 
Monte Rosso arc in these respects very difibren . 
ing not only a very rough, and sometimes ^ 
but displaying likewise, when broken, a varieg»^^^ft 
and unequal texture of parts. They 

speckled, more or less distinctly, and resemble 
sort of granite, of which Monte Rosso is 
and which serves as a base to tire range 
question. It is, in general, not quite so hard 
and Oriental granites, and is sometimes even 
species of granite abounds m France, where ‘ .°^ii'j 
it are to be seen in the adjoining provinces 
Vivarez, and Lionnois. But it is still more (K^ 
T,..!.. +r..if Vir..:i/lnc! lVTr.nU, Ttrtccr»_ the ,i,f 
Italy, seeing that, besides Monte Rosso, 
ill/.,' 
Euganean hills, of which that is a part, 
„e n..,=a iiilis occupy a considerable 
of it ; and tliese 
plains of Lombardy 
Tuscan States 
to Viterbo, on the road 
occupy 
It is also common in tb*^ 'j,/. 
and of this substance the 
to Rome, is entirely _ 
lib'' 
, IS enui>-v i/>. 
The columns of Monte Rosso appear, theretb'^i^^ ij. 
ferent character from any hiflierto 
described 
legists, who mention those only of an bnife"''jj.ji j 
" ' great singularity here is> 
texture. 
But the great singularity nere <=> 
range of prismatic columns sliould be lbunu> ^|,lf ^ 
were, in a mass of granite, and composed 
■ ■ An instance of this kind, 
same substance, 
other causeway, is not recorded ; and this 
render that of Monte Rosso, ib ® .inJ j 
i 
seems to 
least, more ciuious and singular than tire 
Cnusewav is known to be, from the regular ■ 
