[ lo ] 
obferved, that the mafs of hone in the hill above the 
Giants Caufeway, portions of which are reprefented at | 
Fig. 9. in Mrs. drury’s weft profpea, is of the fame j 
quality and texture with the columns themfelves ; which | 
affinity I have conftantly obferved between other ftmi- 
lar bafaltine groups, and the mafles to which they be- ; 
long. It is not therefore extraordinary, that the fame 
fhould alfo be obfervable, between the columns ot Monte 
Roflb, and the fort of granite rock on which they ftand, 
and with which they feem, in a manner, intimately con- 
neaed. For it is further remarkable, that the maftes, or ; 
ftrata, of this granite, though irregular, are yet ranged 
nearly in the fame direaion with the columns above ^ 
them, as may be obferved, if I miftake not, e\en in the 
drawing. But the great ftngularity here is, that fuch a 
' range of prifmatic columns fhould be found bedded, as ; 
it were, in a mafs of granite, and compofed nearly of the 
fame fubftance ; of which I never yet faw or heard any 
other inftance. This circumftance feems therefore to ren- ■ 
der the caufeway of Monte Roftb more curious and fin- 
gular than the famous one in Ireland is known to be, 
from the regular articulation of its columns ; the fame 
phenomenon having lately been dilcovered at Stafta, one 
of the Weftern Iftands of Scotland. Different groups of ar- 
ticulated bafaltine columns have likewife been obferved 
in the province of Auvergne in France; particularly by 
M. BEOST DE VARENNES'^^-’, at Blaud near Langcac ; and 
(i) Sage Elemens de Mineralogie Doclmafticiue, Paris, 1772, 8vo. 
by 
