The point of view implied in this question is being increasingly adopted by all scientific students of social and political opinions, and is most certainly correct. Speculation that is purely philosophic may indeed turn round upon itself. The views of Grecian metaphysicians may continue for ever to find enthusiastic adherents; though even here, in the realm of purely abstract reasoning, the progressive development of science, of psychology, and kindred branches of knowledge cannot fail by its influence to modify the form and arrangement of thought. But in those purely positive sciences (if indeed sciences they can properly be called) which deal with the life of man and its organisation, the very principles and postulates will be found to need continual readjustment.