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Which, is alfo a fmall fizcj when compared with the height 
of thofe of the Giants Caufeway, feme of which meafure 
near forty feet. The columns of the Venetian groups 
manifeft, however, all the varieties of prifmatic forms, 
that are obfervable in thofe of the Giants Caufeway, and 
other fimilar groups. But they are commonly either of 
hve, fix, or feven fides ; and the hexagonal form feems 
moftly to prevail , which, if I miftake not, is alfo remark- 
able in the Giants Caufeway, and, as I believe, in mofi: 
others. Nor is there lefs difference in the texture and 
qualities of thefe columns, than in their forms. Thofe 
of Sail Giovanni prefent a fmooth furface, and, when 
broken, appear within of a dark iron grey colour, mani- 
fefiing alfo a very folid and uniform texture ; in which 
charadlers they correfpond with the columns of the Gi- 
ants Caufeway, and thofe of moft other bafaltine groups. 
But the columns of Monte RofTo are very different in all 
thefe refpe6ls. For they have not only a very rough, and 
fometimes knotty furface ; but, when broken, manifeft a 
variegated -colour and unequal texture of parts. I have 
broken feveral, and have conftantly found them of this 
heterogeneous chara61;er, and conclude, that the reft are, 
as ufual, of the fame ; nor do I apprehend, that, among 
the whole, there is a fingle column of an uniform colour 
and texture, like thofe of moft other groups. They are 
commonly fpeckled, as it were, more or lefs diftindtly, 
and refemble an inferior fort of granite, of which Monte 
Roflb itfelf is formed, and which ferves as a bafe to the 
range of columns in queftion. It is, in general, not quite 
fo 
