Irish land, which has so long puzzled our statesmen, proves to be equally perplexing to our geologists. The metamorphic rocks have excited much controversy, and new problems are emerging. Prof. Hull claims to have found Laurentians in Donegal, Gaiway, and intermediate localities, while Mr. Kinahan, in this Magazine, sums up the evidence for the old opinions. As I have recently studied one of the areas referred to by the latter, I submit a few comments on a part of his paper. I am much indebted to him for the very kind and courteous manner in which he abridged my work by indicating the most important sections, and regret that I must ungratefully repay the obligation by differing widely from his conclusions.