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We may be moving now towards a warmer phase. Half a million years hence this may be a much sunnier and pleasanter world to live in than it is to-day. 2 In the forests and following the grass over the Eocene plains there appeared for the first time a variety and abundance of mammals. Before we proceed to any description of these mammals, it may be well to note in general terms what a mammal is. From the appearance of the vertebrated animals in the Lower Palaeozoic Age, when the fish first swarmed out into the sea, there has been a steady progressive development of vertebrated fish is a vertebrated animal that breathes by creatures.
But they are never exactly like it or like each other. There is always a slight difference, which we speak of as individuality. thousand butterflies this year may produce two or three thousand next year; these latter will look to us almost exactly like their predecessors, but each one will have just that slight difference. It is hard for us to see individuality in butterflies because we do not observe them very closely, but it is easy for us to see it in men. D. 1800, but not one of us now is exactly the same as one of that vanished And what is true of men and butterflies is true generation.
In the Palaeozoic period, as we have said, life had not spread beyond the swampy river valleys and the borders of sea lagoons and the like; but in the Mesozoic, life was growing ever more accustomed to the thinner medium of the air, was sweeping boldly up over the plains and towards the hill-sides. It is well for the student of human history and the human future to THE AGE OF REPTILES THE OUTLINE OF HISTORY 28 If a disembodied intelligence with no note that. knowledge of the future had come to earth and studied life during the early Paleozoic age, he might very reasonably have concluded that life was absolutely confined to the water, and that it could never In the Later Palaespread over the land.