Kinahan — The Economic Geology of Ireland. 349 



opened up Weaver's Boat level in Castle Howard, and found that 

 the driving had been discontinued a short distance west of where 

 it ought to have cut the north Cronebane lode. This level is an 

 important consideration if the East Ovoca mines are again worked, 

 for if it was continued eastward this north lode would be cut in 

 depth, while the Magpie and Connary mines would be unwatered, 

 thereby saving the expense of pumping. 



The minor lodes in the country north of the mineral channel are 

 in nearly parallel fissures. Those in Knockanode, to the north of 

 Ballymurtagh, were very extensively explored without success. 

 Plans and sections of the Knockanode workings are lodged in the 

 Mining Record Office, London. 



It should be put on record that the Carysford Mining Company 

 opened a cast across the country from Kilcarra to the sea, near 

 Arklow Hock. They are said to have only found two small lodes of 

 lead and one of sulphur ; for some reason they missed finding the 

 source of the great Gossan ramp, in the S. W. portion of the 

 Glenart Woods. 



Limestones and Marble. 

 DONEGAL. 



Derriscligh, south of Glen Lough. — A very pure compact white 

 limestone, but apparently not of very great extent. (S. B. Wil- 

 kinson.) 



In the neighbourhoods of Garndonagh and Culdaff, Inishowen, 

 a dark, nearly black limestone, that splits, punches, and chisels 

 well; can be raised in good-sized blocks. (G. Baggs.) 



Crohy, south-west of Dungloe. — A handsome, peculiarly streaked, 

 spotted and mottled black, green, and white ophicalcyte. " Thin- 

 bedded, and not of any great extent or quantity." (J. B. Kilroe.) 



Polished specimens of this stone can be seen in the Geological 

 Museum, Trinity College, Dublin, and in the Science and Art 

 Museum, Leinster House, Dublin. 



DUBLIN. 



In the new railway station, Westland-row, also in the Loop 

 Line City of Dublin Junction Railway, the limestone for rubble 

 work was procured froni Jordan's quarries at Rathgar, and Bayley's 

 quarries at Finglas. The Rathgar stone is very good for founda- 



