A "broad appeal" takes account of the quality of association, and is made to those susceptibilities which are widely distributed. A "narrow" or a "special" appeal is one made to those susceptibilities which are uncommon. But the same individual may respond with very different quality to different stimuli, or to the same stimuli at different times. Human susceptibilities are like an alpine country. There are isolated peaks, there are extensive but separated plateaus, and there are deeper strata which are quite continuous for nearly all mankind. Thus the individuals whose susceptibilities reach the rarefied atmosphere of those peaks where there exists an exquisitive difference between Frege and Peano, or between Sassetta's earlier and later periods, may be good stanch Republicans at another level of appeal, and when they are starving and afraid, indistinguishable from any other starving and frightened person. No wonder that the magazines with the large circulations prefer the face of a pretty girl to any other trade mark, a face, pretty enough to be alluring, but innocent enough to be acceptable. For the "psychic level" on which the stimulus acts determines whether the public is to be potentially a large or a small one.
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Thus the environment with which our public opinions deal is refracted in many ways, by censorship and privacy at the source, by physical and social barriers at the other end, by scanty attention, by the poverty of language, by distraction, by unconscious constellations of feeling, by wear and tear, violence, monotony. These limitations upon our access to that environment combine with the obscurity and complexity of the facts themselves to thwart clearness and justice of perception, to substitute misleading fictions for workable ideas, and to deprive us of adequate checks upon those who consciously strive to mislead.