millions of miles, or whatever the latest big figure may be. CREDIBILITY AND TRUTH. And here I must remind you that our credulity is not to be measured by the truth of the things we believe. When men believed that the earth was flat, they were not credulous: they were using their common sense, and, if asked to prove that the earth was flat, would have said simply, "Look at it." Those who refuse to believe that it is round are exercising a wholesome scepticism. The modern man who believes that the earth is round is grossly credulous. Flat Earth men drive him to fury by confuting him with the greatest ease when he tries to argue about it. Confront him with a theory that the earth is cylindrical, or annular, or hour-glass shaped, and he is lost. The thing he believes may be true, but that is not why he believes it: he believes it because in some mysterious way it appeals to his imagination. If you ask him why he believes that the sun is ninety-odd million miles off, either he will have to confess that he doesn't know, or he will say that Newton proved it. But he has not read the treatise in which Newton proved it, and does not even know that it was written in Latin. If you press an Ulster Protestant as to why he regards Newton as an infallible authority, and St. Thomas Aquinas or the Pope as superstitious liars whom, after his death, he will have the pleasure of watching from his place in heaven whilst they roast in eternal flame, or if you ask me why I take into serious consideration Colonel Sir Almroth Wright's estimates of the number of streptococci contained in a given volume of serum whilst I can only laugh at the earlier estimates of the number of angels that can be accommodated on the point of a needle, no reasonable reply is possible except that somehow sevens and angels are out of fashion, and billions and streptococci are all the rage. I simply cannot tell you why Bacon, Montaigne, and Cervantes had a quite different fashion of credulity and incredulity from the Venerable Bede and Piers Plowman and the divine doctors of the Aquinas-Aristotle school, who were certainly no stupider, and had the same facts before them. Still less can I explain why, if we assume that these leaders of thought had all reasoned out their beliefs, their authority seemed conclusive to one generation and blasphemous to another, neither generation having followed the reasoning or gone into the facts of the matter for itself at all.