Mr. Mellard Reade's book on the “Origin of Mountain Ranges” has now been before the geological public for five years; it has been reviewed in this Magazine and elsewhere, and several more or less weighty objections to the theory have been put forward; but no very complete examination of it has been attempted. This may be partly due to the manner in which Mr. Reade has presented his theory, for he has certainly been too diffuse over points which require very slight illustration and not nearly explanatory enough on other points of great physical difficulty.