Another result should be noted with care. A great popular ferment with a diminution of constitutional control, must result in establishing a military despotism as the lesser evil for the country. Caesar, Aurelian, Cromwell, Napoleon, all arose from the popular party, as the necessary substitutes, by arbitrary action, for the constitutionalism which had been abolished. In the place of the legally regulated courses, more or less unsuitable and corrupted, it proved absolutely necessary when they were abolished to have some other supreme authority with power to enforce obedience. We are not concerned at this point to consider the relative right or wrong of the various parties just mentioned; that has nothing to do with the matter. The lesson is that a violent and rapid change of constitution leads to worse evils than those which it is sought to remedy. Every existing order of things, however imperfect or bad, must have a certain balance of parts or it could not continue. And when that balance is destroyed the results can seldom be foreseen. It is exactly the same in nature; when any species of animal is exterminated suddenly—as by firearms—the far-reaching consequences of its disappearance cannot be anticipated; other species will increase or disappear, and even vegetable life will be modified. The phrase therefore of a "radical reform," or briefly "radicalism," is in defiance of natural science and of historical experience; it denies the principle of gradual evolution in the development of institutions and of character. A small amount of experience of different types is enough to show its fallacy, for radicals say that "travelling abroad always spoils a good radical."