A Discussion on the geological features of a locality between one who has never been on the spot and another who has seen so little of it as not even to know which is the bottom or top of an elaborate section which he has designed to illustrate these very features, is not likely to prove particularly instructive to the geological public, and for these reasons I would gladly have avoided it, had not Mr. Green thought proper to bring my name prominently forward in a paper entitled “Notes on the Geology of part of Co. Donegal,” in last month's Geological Magazine; which paper, it' may be remarked, was read and discussed on the 20th June last at the meeting of the Geological Society, although the Society subsequently declined to print it in the Quarterly Journal.