420 Scientific Proceedings, Royal Dublin Society. 



end of the county at the entrance to Carlingford Lough. The 

 stone at Castle Espie is worked solely for lime. 



At Cultra, on Belfast Lough, a little Carboniferous limestone, 

 associated with Permian dolomyte, occurs below high water-mark. 



Cretaceous, or the White Limestone, occurs in the west of the 

 county, in the north-west slope of the valley of the Lagan. It is 

 worked largely for lime in the neighbourhoods of Moira and Lur- 

 gan. It is too brittle and jointed to be finely tooled or procured 

 in large blocks, but it can be squared by scabbling into blocks 

 suitable for rough masonry. 



Lime in this county is scarce, most of it being imported. It is 

 procured from the Carboniferous limestone at Castle Espie, and from 

 the White Limestones of the Lagan Valley. In places on the coast 

 sea-shells were formerly burned into lime. 



The Permian dolomyte of Cultra, on Belfast Lough, was formerly 

 utilized by being exported to Glasgow for the manufacture of sul- 

 phate of magnesia. 



Dublin. 



Nearly all the limestone in this county is more or less of the 

 Calp type, and varies greatly in character. In general it is only 

 suitable for rubble- work ; but as it can be raised in large sizes it is 

 valuable for foundations. Some beds make good lime, while ad- 

 joining beds may not burn at all. 



The best stones occur near Lucan and Leixlip, near the mearing 

 of the Co. Kildare, from whence they were procured for the Cus- 

 tom House Docks. Calp limestone was also used in the building of 

 the old church in Mount joy-street and the old Christ Church Cathe- 

 dral, while the latter was repaired by Calp brought from Rathgar 

 and Kimmage. For many of the old buildings the stones were so 

 badly selected, that they are now weathered into rotten shaly or 

 earthy masses. 



In the north part of the county there are stones of a coarsely- 

 crystalline character, not well suited for tool- work, but capable of 

 being raised in very large blocks. 



Milverton. — This and other quarries occur in the neighbourhood 

 of Skerries. Grey, coarsely crystalline, compact, and even-bedded.„ 

 father hard to tool, and not well suited for fine work ; but, on ac- 

 count of its strength and the possibility of procuring it in large 



