I n the concluding part of my paper on the Granites of the Northeast of Ireland†, I have expressed the opinion that the granites of the neighbourhood of Newry are divisible, like those of Leinster, into two types, viz, potash- and soda-granites; and that, if a line north of east be drawn through Newry, the granites south of this line are potash-granites, including the Mourne granites, while the granites to the north of this line are soda-granites. As I have obtained additional confirmation of this opinion since the reading of my paper, it will be useful here to sum up the facts known relative to the two kinds of granite in the two districts under consideration.