Kin ah an — On Granite and Metamorphic Hocks. 173 



Donegal Granite Co., now being formed. Quarries in the 

 neighbourhood of Dunglow. Bright-red, greys, and white (p. 233). 



Galway Marble Works, John Millar & Son. Quarries, Bal- 

 lagh, Shantallow, Letteragh, and other places near Gralway. Por- 

 phyritic and mottled reds, pinks, greenish-pink, yellowish, and. 

 chocolate (p. 219). 



Arhlow tSett Quarries, C. S. Parnell. Quarries, Arklow rock. 

 Mottled green (granitone or dioryte) ; not in the market (p. 198). 



Carnsore, Co. Wexford, Lord Keane's Quarries, Came and 

 Carnsore. Reds, and at the latter a course of delicate flesh- 

 colour; not as yet in the market (p. 205). 



Architects do not always use polished granites judiciously. 

 Some stand the weather much better than others ; and the latter, 

 often more or less beautiful, are more suited for inside than for 

 outside work. From an examination of outside polished works in 

 Ireland, England, Scotland, Canada, and the United States, I find 

 that many of the granites employed in outside polished work are 

 not suitable therefor, especially some of the largely crystalline 

 varieties. The harder and more compact the stone, the more lasting 

 the polish. 



[In Ireland the stones that seem best for retaining- their polish are basalts and some 

 of the other hard whinstones, if they do not contain iron, very silicious granite, quartz- 

 rock, and quartzyte, as these, after ages of exposure, have retained the polish wrought 

 on them during the glacial period. Such whinstones and granites would be costly and 

 difficult to work, and few persons now-a-days would like to go to the necessary ex- 

 pense. Somewhat similar remarks might be made in reference to quartz-rock and 

 quartzyte ; the latter rocks, however, will not dress, nor even saw, across the grain.] 



A granite quarry, to be profitable, ought to be able to produce 

 large blocks suitable for monoliths and all sorts of monumental 

 purposes, stone for all description of cut-stone work, paving-setts, 

 kerbs, and channel stones ; while the detritus should be ground up 

 into coarse sand for the manufacture of blocks for paths and road- 

 ways. 



For building, especially cut-stone purposes, the Intrusive Gran- 

 ites are usually much superior to those of metamorphic origin ; as 

 in the former, with but few exceptions, there are systems of what 

 the quarrymen call " grains." These are lines, often recognizable 

 only by trained eyes, along which the stones readily split. In 



