In the October Number of this Magazine, a paper by the Rev. A. Irving, D.Sc, calls for some comment. The subject, “The Malvern Crystallines,” is one which has engaged my close attention during the last seven years, and two expositions of my views have appeared in the Quarterly Journal of the Geological Society. I am glad to find that Dr. Irving accepts my main conclusion —that the Malvern gneisses and schists are of igneous origin; but there are some important details in which he has formed a different opinion. It will not be necessary for me to discuss these differences with any fulness, since my third and final paper, which is nearly ready, treats of some of his more material objections to my views.