220 Scientific Proceedings, Royal Dublin Society. 



No. 2, Shantallow. — Fine-grained; red; maculated white, with 

 a little black ; polishes well ; blocks up to 5 and 7 feet long ; a 

 very serviceable stone. 



No. 3, Ballagh, near Bush Park. — Porphyritic ; red and greenish 

 yellow, with large flesh-coloured crystals; polishes well; can be 

 raised in long and very large blocks ; a handsome stone. Here 

 was obtained the pedestal for Dargan's monument, Leinster Lawn, 

 Dublin. 



No. 4, Letteragh, north of Pahoon House. — Lighter in colour 

 than Ballagh stone (No. 3) ; coarser in grain than the St. Helen's 

 and Shantallow ; clouded and mottled greenish and purplish, with 

 large bright-red isolated crystals and blebs of quartz ; allied to an 

 elvan ; can square 4' 6" x 2' 6" x 2' ; some blocks over 6 feet long. 

 This has been only recently opened, and it is expected to improve 

 in depth. 



No. 5, Shantallow (again). — Chocolate- colour, with large bright- 

 red crystals of orthoclase and blebs of quartz. A granitone, or 

 basal elvan, seems to be allied to the Bunclorragha euryte. 



Messrs Millar's quarries, except No. 3, are in veins of granite 

 or elvan, in which blocks suitable for general purposes, but not of 

 very great size, are procurable ; the granite No. 3, however, not 

 only in the neighbourhood of Galway, as already mentioned, but 

 in the whole county forming the north-side of Gal way Bay and in 

 Omey Island, can afford blocks as large as it is usually practicable 

 to work. Some of the boulders on that tract that have stood the 

 effects of weathering, since the glacial period, being as large as 

 some of the mediaeval castles (see g. s. m. sheets, 104, 105, &c). 

 The vein-granites, however, that are being worked by the Millar's 

 are of sizes fit for all ordinary work, they being specially suitable 

 for inside decoration ; the diversity in colour and texture being 

 most effective, especially if used in slab-work, such as dados and the 

 like. 



The uncoursed rubble used in Galway prison was procured from 

 one of the elvans in Shantallow ; very durable, but too hard for 

 chisel-work. [R. Cochrane.) 



Good building- stones of any scantling are procurable nearly 

 everywhere in the granite region, at the surface or in blocks ; con- 

 sequently no large quarries have been opened, these easily procur- 

 able stones having been sufficient to meet local requirements ; at 



