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of the factory and the farm enormously multiplies bodily skill and vigor. Countless trained intelligences are at work to teach us how to avoid or counteract the effects of waste. Of course some of the agents in the modern scientific development of natural resources deal with resources of such a kind that their development means their destruction, so that exploitation on a grand scale means an intense rapidity of development purchased at the cost of a speedy exhaustion. The enormous and constantly increasing output of coal and iron necessarily means the approach of the day when our children's children, or their children's children, shall dwell in an ironless age--and, later on, in an age without coal--and will have to try to invent or develop new sources for the production of heat and use of energy. But as regards many another natural resource, scientific civilization teaches us how to preserve it through use. The best use of field and forest will leave them decade by decade, century by century, more fruitful; and we have barely begun to use the indestructible power that comes from harnessed water. The conquests of surgery, of medicine, the conquests in the entire field of hygiene and sanitation, have been literally marvellous; the advances in the past century or two have been over more ground than was covered during the entire previous history of the human race. The advances in the realm of pure intellect have been of equal note, and they have been both intensive and extensive. Great virgin fields of learning and wisdom have been discovered by the few, and at the same time knowledge has spread among the many to a degree never dreamed of before. Old men among us have seen in their own generation the rise of the first rational science of the evolution of life. The astronomer and the chemist, the psychologist and the historian, and all their brethren in many different fields of wide endeavor, work with a training and knowledge and method which are in effect instruments of precision, differentiating their labors from the labors of their predecessors as the rifle is differentiated from the bow. The play of new forces is as evident in the moral and spiritual world as in the world of the mind and the body. Forces for good and forces for evil are everywhere evident, each acting with a hundred- or a thousand-fold the intensity with which it acted in former ages. Over the whole earth the swing of the pendulum grows more and
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