436 Scientific Proceedings, Royal Dublin Society. 



Ardbreccan. Three miles from Navan. — Brownish-grey ; when 

 dressed, grey, very crystalline ; works very freely ; can be obtained of 

 very large sizes ; a very superior working-stone. Has been exten- 

 sively used at Navan, Trim, Kells, Slane, and elsewhere — even at 

 great distances. 



Crossclrum. — Two miles west of Oldcastle. Whitish-grey ; very 

 pure ; works freely. Can be obtained in blocks of large sizes. 



JRosscastle or Cashel. — Seven miles from Oldcastle, close to Lough 

 Sheelin and the mearing of the county ; a very superior stone and 

 in much request. It is like the Crossdrum stone, but of a finer tex- 

 ture and lighter colour; is extensively used in this county and in 

 Cavan and Longford, the columns in the R. C. Church of the latter 

 having been procured there. It was also used in the building of 

 Loughcrew House. 



Crossagh, near Hosscastle. — The stone is very similar, but coarse : 

 yet it is more preferred by the builders in Dublin. 



Trim. — Dark-blue to blackish ; of the Calpy type ; earthy, but 

 compact ; even-bedded ; a good workable stone for plain building, 

 but will not dress well. Has been used in most of the public build- 

 ings in Trim, also in the old Norman castle and ecclesiastical struc- 

 tures ; but in the latter sandstone has been employed where cut 

 stone was required. 



Drogheda. — Near Drogheda the stone is, in general, grey and 

 brittle ; but to the eastward it is dark-grey to blackish ; of a Calpy 

 nature, and can be raised in very large blocks suitable for rough 

 work. Large quarries were opened at the east margin of the town, 

 from which were procured the stones to build the Boyne Yiaduct ; 

 the dressing and cut-stone work being brought principally from 

 Ardbreccan or Milverton, near Skerries, Co. Dublin. Farther east- 

 ward, adjoining the river flats, there are the Corporation quarries, 

 from which were procured the stones for the extensive harbour 

 improvements. 



Lime very good ; made from the Carboniferous limestone and 

 from the boulders in the drift. 



Monaghan. 



The limestone is of Carboniferous age, and is generally of a Calpy 

 nature, not suitable for tool-work., Some of the best stones in the 



