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 equation has several roots, some of them imaginary. In solving a physical problem the scientist begins by disentangling the forces involved and then, taking them one at a time, calculates what would be the effect if the other forces did not act. So Wells is applying the scientific method to sociology when he attempts to isolate social forces and deal with them singly. If nothing intervenes to divert it, says the hydraulic engineer, the water of this mountain stream will develop such a momentum on reaching the valley. If no limitations are placed upon the consolidation of capital, says Mr. Wells, we may have a handful of directors ruling the world, as depicted in "When the Sleeper Wakes."

In its power to forecast the future science finds both its validation and justification. By this alone it tests its conclusions and demonstrates its usefulness. In fact, the sole object of science is prophecy, as Ostwald and Poincaré make plain. The mind of the scientific man is directed forward and he has no use for history except as it gives him data by which to draw a curve that he may project into the future. It is, therefore, not a chance direction of his fancy that so many of Wells's books, both romances and studies, deal with the future. It is the natural result of his scientific training, which