The current conception of liberty is both negative and individualistic. It rests upon obsolete assumptions. Philosophers may be conscious of the defects of such assumptions, but even that is doubtful; and clearly the average journalist or politician is by no means aware of them, for the advocates of “ liberty,” in the old sense, have a very weak case, and its opponents attack it on the wrong grounds. The controversy in the lecture-room is not important. The quarrels of commentators are trivial. But there is a mortal conflict between the advocates and opponents of liberty in the sphere of government, industrial organization, and education. In the policies of those who have social power the conflicting conceptions of liberty are operative; and the battle is still uncertain, because it is normally fought upon the basis of unexamined assumptions.