Transactions is unable to publish the large number of communications we have received on this subject. Following are two representative letters. Disputing Dr. Hutton's theory Dear Sir, - A close scientific examination of the earth's features proves, on grounds decisive and incontrovertible, that catastrophic events, such as earthquakes and floods, provide the only convincing explanation of the changes that have affected the earth. It is immediately evident that a slow process of change would be insufficient to create such majestic features as earth's soaring mountain peaks and deep canyons. I also find highly improbable the proposition that further geological changes will occur on the earth. I must second the views of my esteemed colleague Mr. Richard Kirwan, who has stated that Dr. Hutton's theory on the age of the earth plunges the reader into an abyss of time "from which human reason recoils." Indeed, it verges on atheism. With sentiments of sincere esteem and friendship, I am, dear sir, Your obedient and humble servant, Dugald Graham Favoring Dr. Hutton's theory Dear Sir, - My friend Dr. James Hutton has favored me with the sight of his pamphlet Abstract of a Dissertation... Concerning the System of the Earth, Its Duration, and Stability, which he has circulated privately. At first, I was induced to reject his system entirely, and should probably have continued to do so, with the great majority of the world, but for my friendship with the author. I was induced by the numerous original facts which his system had led him to observe to listen to his arguments. After months of almost daily debate with Dr. Hutton on the subject of his theory, I began to view his fundamental principles as a true testimony to the power of the Scientific Method. Dr. Hutton's evidence that the earth's features have been changing since the beginning of time and will continue in the same manner is compelling. Equally persuasive are his arguments that the rocks we walk amongst daily were formed deep in volcanoes. If Dr. Hutton is correct - and I believe he is - earth is, indeed, more ancient than can be imagined, and holds many ancient secrets yet to be revealed. Be assured that I am, with the greatest respect and esteem, dear sir, Your obedient and humble servant, Sir James Hall