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Fancies versus Fads do so for a reason that seems to me worthy of some little consideration. I do it because this does happen to be exactly one of those questions on which, as it seems to me, the independent critic has really a right to check the specialist. For it is a larger question of logic, and not a smaller question of fact. It is like the difficulty of believing that a halfpenny can fall head or tail a hundred times running; which has nothing to do with the numismatic value of the coin. It is like the difficulty of believing that a mere tax could make a loaf cheaper, which has nothing to do with the agrarian craft of growing corn. There is a general tide of reason flowing against such improbabilities, even if they are possibilities; they would still be exceptions, and reason would be on the side of the rule. And whatever the details of natural history, this thing is against the very nature of things.

To explain what I mean I will take this parallel of the technique of music, of which I know even less than of the technique of natural history. To begin with a simple though moving musical instrument, suppose an expert told me that a coach-horn could be blown quite as well if it were only two feet long. I should believe him; partly because it seems probable enough, and partly because I know nothing about the matter. I am not even an incompetent coach-horn blower. But I should certainly not believe him if he told me, as a generalization about all musical instruments, that half a musical instrument was better than no music, or even as good as any music. I should disbelieve it because it is inconsistent with the general nature of a musical instrument, or any instrument. I should disbelieve it long before I had thought of the thousand 188