Proffessor Hull's criticisms (pp. 491–5 of this volume) on a former paper of mine on the “Classification of the Permian and Trias” lay upon me the burden of a brief reply. I may say that Prof. Hull seems to suppose that the task which I had set myself was more ambitious in its scope and aim than I was conscious of; it was not my purpose “to review the whole question of the relations of British Permian and Trias” in a paper which was limited by its title to the European rocks, and from which these systems in other parts of the world were intentionally omitted. My idea was rather to give to readers of the Geol. Mag. an opportunity of forming some judgment on the results which might be fairly gathered from a digest of the opinions collected from the various members of the “Sub-Committee on Permian and Trias.” taken along with the information which exists in the literature of this subject in England and on the Continent, more especially in Germany; and to raise discussion thereupon before the assembly of the Berlin Congressin1884.