of the Counties of Deny and Antrim . 221 
When we examine the assemblage of hummocks above 
Knockmult , that is, Sconce, Fermoyle, and Altabrian , we find 
their materials and stratification, precisely similar to that of 
the country below them to the eastward, where the abrup- 
tions of the strata are displayed in long stony ridges ; — to the 
south, the abruptions on the summit of Ready mountain dis- 
cover the same similarity; and to the north-west the grand 
facade of Magilligan Rock, three miles distant, displays an 
accumulation of exactly the same sort of strata consolidated 
into an enormous mass. 
The hummock of Dunmull is formed of two very particular 
strata, a columnar, and an irregular prismatic ; but I shewed 
you, a mile to the northward, at the fapades and quarries of 
Islamore and Craig ahuller, at the base of the hill, that the 
whole ridge, on the summit of which Dunmull is placed, was 
a consolidated mass, formed by alternate strata of the same 
description : and that the arrangement of the whole country 
below, and adjacent, was precisely the same with that of the 
hummock of Clogher, I proved to you at the curious opening of 
the strata at Bushmills Bridge, and in the facades at the 
Giant’s Causeway. 
After these proofs that so many (and I might proceed to 
the rest) of our detached hummocks, are in their construction 
and materials, similar to, and connected with, the main conso- 
lidated masses of which our country is formed, I think it will 
scarcely be asserted that these hummocks were originally 
formed, solitary and separate as they now stand ; but rather 
that they were once parts of that vast whole, and left behind 
in their present form, upon the removal of the contiguous 
portions of their strata, by some powerful agent, of whose 
