“The bulk of such opinions must necessarily be without rational basis, since many of them are concerned with problems admitted by the expert to be still unsolved, while as to the rest it is clear that the training and experience of no average man can qualify him to have any opinion upon them at all. The rational method adequately used would have told him that on the great majority of these questions there could be for him but one attitude--that of suspended judgment.” The reader will recall from his own experience an almost infinite number of instances in which the amateur has been fully prepared to deliver expert advice and to give final judgment in matters upon which his ignorance is patent to every one except himself. In the Middle Ages, society was convinced that there were witches. People were so positive that they burned people whom they suspected of witchcraft. To-day there is an equal number of people who believe just as firmly, one way or the other, about spiritualism and spirits. They do not burn mediums. But people who have made no research of the subject pass strong denunciatory judgments. Others, no better informed, consider mediums divinely inspired. Not so long ago every intelligent man knew that the world was flat. To-day the average man has a belief just as firm and unknowing in the mysterious force which he has heard called atomic energy. It is axiomatic that men who know little are often intolerant of a point of view that is contrary to their own. The bitterness that has been brought about by arguments on public questions is proverbial. Lovers have been parted by bitter quarrels on theories of pacificism or militarism; and when an argument upon an abstract question engages opponents they often desert the main line of argument in order to abuse each other. How often this is true can be seen from the congressional records of controversies in which the personal attack supersedes logic. In a recent fight against the proposed tariff measures, a protagonist of protection published long vindictive statements, in which he tried to confound the character and the disinterestedness of his opponents. Logically his discussion should have been based only upon the sound economic, social and political value of the bill as presented. A hundred leading American bankers, business men, professional men and economists united in public disapproval of this plan. They stated their opinion that the “American” Valuation Plan, as it was called, would endanger the prosperity of the country, that it would be inimical to our foreign relations and that it would injure the welfare of every country with whom our commercial and industrial ties were at all close. This group was a broadly representative group of men and women, yet the chairman of the Ways and Means Committee accused all these people of acting upon motives of personal gain and lack of patriotism. Prejudice superseded logic.