John Stuart Mill, the English philosopher, economist, and administrator, was the most influential philosopher in the English-speaking world during the nineteenth century and is generally held to be one of the most profound and effective spokesmen for the liberal view of man and society. In the belief that men's opinions are the dominant influence on social and historical change, Mill tried to construct and to propagate a philosophical position that would be of positive assistance to the progress of scientific knowledge, individual freedom, and human happiness. Despite numerous flaws in his theories, he succeeded in providing an alternative to existing views on morals and politics and their foundations that was both specific and cohesive enough to give a markedly liberal tendency to social and political opinion, and also sufficiently tolerant and inclusive to gain it access to an extraordinarily large and diverse...