record, does not specify, than the accuracy of a map, constructed on the scale of half an inch to the hundred miles, would be impugned by proving that it omitted a particular wood, rock, hill, or village. It is indispensable to the establishment of this theory, that the geological changes which the earth has undergone, shall admit of being arranged in certain divisions. The lines of demarcation between these may be drawn within wide limits of variation; but should it become an unquestioned truth of geologic science that absolute uniformity of phenomena has reigned in our world so long as the geologist traces its history, the Age theory would be untenable. The theory does not require that the 'solutions of continuity' should be abrupt or catastrophic. On the contrary, the 'morning' and' evening' of the Mosaic record suggest gradation; and the pause of night, with its silence, its slumber, its gathering up of force for new outgoings of the creative energy, by no means suggests cataclysm or revolution. But the days or periods, though they may melt into each other with the tender modulation of broad billows on a calming sea, must possess a true differentiation, and cannot be accepted by those who believe in absolute geological uniformitarianism. We are not sure, however, that any geologists profess this creed, and the views propounded by very eminent geologists on the nature of the changes which have taken place on the earth appear to us to satisfy the requirements of the Age theory, in respect of division and succession. In the sixth edition of his 'Elements of Geology' Sir Charles Lyell writes thus:--'Geology, although it cannot prove that other planets are peopled with appropriate races of living beings, has demonstrated the truth of conclusions scarcely less wonderful--the existence on our planet of so many habitable surfaces, or worlds as they have been called, each distinct in time, and peopled with its peculiar races of aquatic and terrestrial beings.' He proceeds to state that living nature, with its inexhaustible variety, displaying 'infinite wisdom and power,' is 'but the last of a great series of pre-existing creations.' Mr. Darwin, in the fourth edition of his 'Origin of Species,' makes the weighty remark that 'scarcely any palæontological discovery is more striking than the fact, that the forms of life change almost simultaneously throughout the world.' Qualifying his words by the statement that they apply chiefly to marine forms of life, and that the simultaneity referred to, does not necessarily fall within 'the same thousandth or hundred-thousandth year,' he writes as follows:--