Kinahan — On Irish Arenaceous Rocks. 11 



very cheaply wrought ; but unfortunately they are often liable to 

 receive a glassy polish. A quartozse felspathic grit, however, if it 

 splits easily, is a cheap and good stone. 



Some localities where good grit setts can be procured have 

 been mentioned in my previous Paper. 1 The Irish localities from 

 which granite and whinstone setts are now sent into the market 

 will be mentioned hereafter in the section treating on those rocks. 



Mosaic Pavement has lately been more or less in demand. The 

 ancient Eomans used principally fragments of marble, introduc- 

 ing, however, pieces of glass and terra cotta to give tints. The 

 modern Italians also use principally marble fragments. Messrs. 

 Sibthorpe and Son, of Dublin, are trying to start a new Irish 

 industry by bringing over Italians to teach Irish workmen the art. 

 Mosaic pavement, consisting entirely of terra cotta, seems to be a 

 modern invention. 



A sort of rough mosaic work is seen in some of the English 

 towns, pieces of flags placed on edge being used for pavement. 

 For similar work there is plenty of materials in Ireland at the 

 various flag quarries, especially those of Kilkenny and Clare, 

 where the detritus might readily and cheaply be dressed into setts 

 suitable for pathways and such like. These, if cut, would make a 

 beautiful floor, permanent in character, and unique in appearance. 



ANTRIM. 



Portrush. — Church of the Holy Trinity, Portrush, Mr. Christie's 

 quarry, Dunmurry, Draperstown, Co. Londonderry. The stone, 

 when raised from the quarry, deep red, but when dressed, pale 

 pink, and some beds whiteish. Dresses very fine, and especially 

 suitable for fine inside work. The blocks should be laid on their 

 quarry beds. All the columns and part of the windows are of this 

 stone. New Wesleyan Church ; from Altmore, Dungiven, Co. 

 Londonderry, and Gortnaglosh, Dungannon, Co. Tyrone. The 

 Altmore stone — yellowish, coarse-grained, and rather hard ; used 

 for quoins and courses without mouldings. The Grortnaglosh stone 

 is of a buff colour, fine-grained, and especially suitable for mould- 

 ings and dressed windows ; the large windows and porch of this 

 stone. In places it shows slight iron stains. (B. G. Symes.) 



1 Scientific Proceedings, E.D.S., vol. v., pp. 543, 563, &c. 



