432 Scientific Proceedings, Royal Dublin Society. 



the stones were procured to build the Abbey, and the Q-eraldine 

 town of Kilmallock. In the latter, a few years ago, there were 

 excellent examples of this ancient cut-stone work ; but during 

 the last twenty-five years nearly all these old structures have been 

 removed. 



The lime in this county, in general, is good; but that made 

 from the Churchtown stone (Newcastle West) is poor in strength, 

 and slacks slowly : the lime made from the Calp, near Rathkeale 

 and Adair, is also poor. 



At Robertstown, between Barrigone and Foynes, there is a 

 stone that gives a good hydraulic lime, which was used at Askea- 

 ton Mills. In Gilloge Loch quarry, two and a- half miles north- 

 east of Limerick, there is a good hy draulic limestone, which was 

 used extensively during the building of the new dock at Limerick. 



Londonderry. 



This county is another of those in which there is very little 

 Carboniferous limestone ; it only being found in a tract between 

 Maghera and Magherafelt. It is principally quarried for lime- 

 burning, some of it being hydraulic. 



Along the margin of the doloryte plateau, White Limestone 

 appears in places, and is rather largely quarried, but principally 

 for lime-burning, as its brittleness and jointy character make it 

 yield unequally to the hammer, and unfit for fine tool-work. It 

 can, however, be scabbled into blocks of small dimensions, which 

 can be used in rough masonry. 



In the hill-country, especially south and south-west of Dun- 

 given, there are many beds of metamorphic limestone (Ordovician ?) 

 quarried principally for lime-burning. 



The principal quarry in the Cretaceous rocks is at — 



Spring Hill (Moneymore). — White; very pure; hard; fissured 

 and cracked. Cannot be raised in large sound blocks. Can be 

 scabbled into blocks of small size. Extensively used in Moneymore 

 when building the principal houses. 



The quarries in the Carboniferous limestone are as follows : — 



Desert Martin. — Bluish and brownish ; rubbly; some beds 

 yellowish-grey ; • solid ; finely granular ; crystalline, magnesian, 

 and hydraulic. Used almost entirely for lime-burning. 



