of Berry and Antrim. 20? 



south, the abruptions on the summit of Keady mountain 

 discover the same similarity; and to the north-west the 

 grand facade of MagUligan Rock, three miles distant, dis- 

 plays an accumulation of exactly the same sort of strata con- 

 solidated into an enormous mass, 



The hummock of Dunmull is formed of two very parti- 

 cular strata, a columnar, and an irregular prismatic ; but I 

 showed you, a mile to the northward, at the facades and 

 quarries of Islamore and CraigahuUer, 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 Clog her, 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 construc- 

 tion and materials, similar to, and connected with, the main 

 consolidated masses of which our country is formed, I think 

 it will scarcely be asserted that these hummocks were origi- 

 nally formed, solitary and separate as they now stand j but 

 rather that they were once parts of that vast whole, and left 

 behind in their present form, upon the removal of the con- 

 tiguous portions of their strata, by some powerful agent, of 

 whose operations and modes of actings we have hitherto ob- 

 tained little knowledge. 



The highest point on the facade of Cave Hill is called 

 M e /lrt's Castle, and appears to be a solitary fragment of a 

 stratum, precisely similar to those below it, and obviously 

 once extended like them. 



The irregularity of the summit of Fairhcad, plainly shows 

 that its gigantic columns once reached higher. 



And in the facade of MagUligan, the highest of all, a few 

 desultory patches of an upper stratum (no doubt once perfect 

 and continuous) are to be traced along its summit. 



Our mountains themselves seem to show clearlv that they 

 were once higher ; the top of MagUligan mountain is an ex- 

 tensive 



