Mill in effect combined the qualities of the historical and the critical schools of thought. His was not the vigorous hammering method of previous Liberals, but a cold, illuminating, and suggestive examination, which gave full credit to the existing institution, even while it displayed its defects. He asked, "How has it grown?" as earnestly as "How does it work?" and he lamented the indifference of his predecessors to history. "No one can calculate what struggles, which the cause of improvement has yet to undergo, might have been spared if the philosophers of the eighteenth century had done anything like justice to the past."[288] Every institution is to be studied historically, though it must be justified empirically. If it is bad in use, it must be reformed or abolished, but the change must be made along the line of past growth. What he said of the position of women he applied to every other problem. "The least that can be demanded is, that the question should not be considered as prejudged by existing fact and existing opinion, but open to discussion on its merits, as a question of justice and expediency; the decision on this, as on any of the other social arrangements of mankind, depending on what an enlightened estimate of tendencies and consequences may show to be most advantageous to humanity in general.... Through all the progressive period of human history, the condition of women has been approaching nearer to equality with men. This does not of itself prove that the assimilation must go on to complete equality, but it assuredly affords some presumption that such is the case."[289] This double view, combining the Radical view of Bentham with the historical {240} view of Burke, enabled Mill to see his subject, as it were, stereoscopically and in true relation with its surroundings. He was not influenced by Darwin's theory of evolution. But his own work produced a very similar effect. It made men accustomed to the idea of continuous alteration, of future as well as past growth.