The Power That Preserves | My Web Site Page 313 Chapter 01 Page 06

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Further, our student must submit to a thorough grounding in world-geography with its physical and human sides welded firmly together. He must be able to pick out on the map the headquarters of all the more notable peoples, not merely as they are now, but also as they were at various outstanding moments of the past. His next business is to master the main facts about the natural conditions to which each people is subjected--the climate, the conformation of land and sea, the animals and plants. From here it is but a step to the economic life--the food-supply, the clothing, the dwelling-places, the principal occupations, the implements of labour. A selected list of books of travel must be consulted. No less important is it to work steadily through the show-cases of a good ethnological museum. Nor will it suffice to have surveyed the world by regions. The communications between regions--the migrations and conquests, the trading and the borrowing of customs--must be traced and accounted for. Finally, on the basis of their distribution, which the learner must chart out for himself on blank maps of the world, the chief varieties of the useful arts and appliances of man can be followed from stage to stage of their development.

The less skilful builders sometimes depart from their usual habit, and take up with the abandoned nest of some other species. The blue-jay now and then lays in an old crow's-nest or cuckoo's-nest. The crow-blackbird, seized with a fit of indolence, drops its eggs in the cavity of a decayed branch. I heard of a cuckoo that dispossessed a robin of its nest; of another that set a blue-jay adrift. Large, loose structures, like the nests of the osprey and certain of the herons, have been found with half a dozen nests of the blackbird set in the outer edges, like so many parasites, or, as Audubon says, like the retainers about the rude court of a feudal baron.

In the case of the river Somme we have a valley in some places a mile or more in width, and about two hundred feet in depth. This has mostly been excavated in chalk rock. Taking our present large rivers as a basis, it would require from one to two hundred thousand years for the Somme to perform this work.<36> It will not do, however, to take the present action of our rivers as a guide, since we have every reason to suppose this work went forward much more rapidly in past times. But we can not escape the conclusion that it demands a very long time indeed to explain it. The valley has remained in its present shape long enough to admit the formation of great beds of peat in some portions. Peat is formed by the decomposition of vegetable growth. Its growth is in all cases slow, depending entirely upon local circumstances. European scholars who have made peat formation a special study assure us that to form such immense beds as occur near Abbeville, several thousand years are required, even under the most favorable conditions.

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