In order to ascertain the process by which this state of mind has been attained, we may take an example in a sphere which is happily removed from controversy. There are very few persons with whom the fictitious character of fairy tales has not ceased to be a question, or who would hesitate to disbelieve or even to ridicule any anecdote of this nature which was told them, without the very smallest examination of its evidence. Yet, if we ask in what respect the existence of fairies is naturally contradictory or absurd, it would be difficult to answer the question. A fairy is simply a being possessing a moderate share of human intelligence, with little or no moral faculty, with a body pellucid, winged, and volatile, like that of an insect, with a passion for dancing, and, perhaps, with an extraordinary knowledge of the properties of different plants. That such beings should exist, or that, existing, they should be able to do many things beyond human power, are propositions which do not present the smallest difficulty. For many centuries their existence was almost universally believed. There is not a country, not a province, scarcely a parish, in which traditions of their appearance were not long preserved. So great a weight of tradition, so many independent trains of evidence attesting statements perfectly free from intrinsic absurdity, or even improbability, might appear sufficient, if not to establish conviction, at least to supply a very strong _primâ facie_ case, and ensure a patient and respectful investigation of the subject. It has not done so, and the reason is sufficiently plain. The question of the credibility of fairy tales has not been resolved by an examination of evidence, but by an observation of the laws of historic development. Wherever we find an ignorant and rustic population, the belief in fairies is found to exist, and circumstantial accounts of their apparitions are circulated. But invariably with increased education this belief passes away. It is not that the fairy tales are refuted or explained away, or even narrowly scrutinised. It is that the fairies cease to appear. From the uniformity of this decline, we infer that fairy tales are the normal product of a certain condition of the imagination; and this position is raised to a moral certainty when we find that the decadence of fairy tales is but one of a long series of similar transformations.