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Dividend Two Directory 20
Page 03
Now, we have seen that the question of the antiquity of man is intimately connected with that of the Glacial Age. That is to say, the relics of man as far as we know them in Europe, are found under such circumstances that we feel confident they are not far removed from the period of cold. For it will be found that those conservative scholars who do not think that man preceded the Glacial Age, or inhabited Europe during the long course of years included in that period, do think he came into Europe as soon as it passed away. So, in any case, if we can determine the date of the Glacial Age, we shall have made a most important step in advance in solving the problem of the antiquity of man himself. So it seems to us best to go over the subject of the Glacial Age again, and see what conclusions some of our best thinkers have come to as to its cause, when it occurred, and other matters in relation to it.
Once started in the launch _Rimac_, we went through interesting channels, outlets of the main stream being often noticeable on either bank, cutting wide passages through the forest and forming one or more shallow lakelets, with innumerable aquatic plants on the surface of the water. As we went farther it became easy to understand how islands were constantly forming in the river. Quantities of large and small logs of wood were continually floating down the stream; the banks were gradually being eaten away by the current. Whole trees fell down with their immense branches and polypi-like roots, and formed a barrier arresting the progress of the floating wood. Particles of earth deposited by wind and by water saturated with impurities settled there. Soon grass would begin to grow on those deposits, which quickly collected more deposits of flying and floating particles. The soft bottom of the river, disturbed by the deviated current, piled up mud against the submerged branches resting on the river-bed. Quickly an island was then formed; more wood accumulated, more grass, more mud; the base of the islands would increase rapidly, and in the space of a few years islands several kilometres in length rose above the water.
Which of us cannot look back in youth to the mysteries of the stickleback fisheries? Captains courageous, we sailed forth with bent pin and piece of thread, to woo the wily quarry with half an inch of chopped earthworm. For stickleback abound in every running stream and pond in England. They are beautiful little creatures, too, when you come to examine them, great favorites in the fresh-water aquarium; the male in particular is exquisitely colored, his hues growing brighter and his sheen more conspicuous at the pairing season. There are many species of sticklebacks--in England we have three very different kinds--but all are alike in one point which gives them their common name, that is to say, in their aggressive and protective prickliness. They are armed against all comers. The dorsal fin is partly replaced in the whole family by strong spines or "stickles," which differ in number in the different species. One of our English sorts is a lover of salt water: he lives in the sea, especially off the Cornish coast, and has fifteen stickles or spines; on which account he is commonly known as the Fifteen-spined Stickleback; our other two sorts belong to fresher waters, and are known as the Ten-spined and the Three-spined respectively.
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