This comprehensive collection, bringing together significant essays by leading philosophers of the twentieth century, represents one prominent school of American thought philosophic naturalism. Naturalism holds that nature is objective and can be studied to gain knowledge that is not determined by methodology, perspective, belief, or theory. For the naturalist, "nature" is an all-encompassing concept; nothing is other than natural and any notion of a supernatural realm is rejected. Naturalism, however, cannot be equated with materialistic reductionism or strict determinism. Certain nonmaterial aspects of human existence thoughts, feelings, meanings, values, beliefs, ideals, and free will are included within the scope of the naturalist's approach.