"Yes, indeed," said the doctor, "and always to the notable improvement of the social condition, though it may sound ungrateful to say so. Take the case of the horse, for example. With the passing of that long-suffering servant of man to his well earned reward, smooth, permanent, and clean roadways first became possible; dust, dirt, danger, and discomfort ceased to be necessary incidents of travel. "Thanks to the passing of the horse, it was possible to reduce the breadth of roadways by half or a third, to construct them of smooth concrete from grass to grass, leaving no soil to be disturbed by wind or water, and such ways once built, last like Roman roads, and can never be overgrown by vegetation. These paths, penetrating every nook and corner of the land, have, together with the electric motors, made travel such a luxury that as a rule we make all short journeys, and when time does not press even very long ones, by private conveyance. Had land travel remained in the condition it was in when it depended on the horse, the invention of the air-car would have strongly tempted humanity to treat the earth as the birds do--merely as a place to alight on between flights. As it is, we consider the question an even one whether it is pleasanter to swim through the air or to glide over the ground, the motion being well-nigh as swift, noiseless, and easy in one case as in the other." "Even before 1887," I said, "the bicycle was coming into such favor and the possibilities of electricity were beginning so to loom up that prophetic people began to talk about the day of the horse as almost over. But it was believed that, although dispensed with for road purposes, he must always remain a necessity for the multifarious purposes of farm work, and so I should have supposed. How is it about that?" TWENTIETH-CENTURY FARMING. "Wait a moment," replied the doctor; "when we have descended a little I will give you a practical answer." After we had dropped from an altitude of perhaps a thousand feet to a couple of hundred, the doctor said: "Look down there to the right." I did so, and saw a large field from which the crops had been cut. Over its surface was moving a row of great machines, behind which the earth surged up in brown and rigid billows. On each machine stood or sat in easy attitude a young man or woman with quite the air of persons on a pleasure excursion. "Evidently," I said, "these are plows, but what drives them?"