The vulgar mind is very prone to love the marvellous, and to count for a prodigy every unusual phenomenon, every occurrence not perfectly accountable on any hypothesis which is familiar to them. The poetical period of history in every country is full of prodigies; for in the dawn of civilisation the physical laws of nature are little understood, and multitudes of natural phenomena are either referred to false causes, or, being unreferrible to any recognised cause, are set down as mere wonders. It is the province of science to dispel these delusions, to expose the undiscovered, but by no means undiscoverable, origins of unusual events, and thus to be continually narrowing the limits of the unknown. These limits, however, have not even yet quite reached the minuteness of a mathematical point; and there are a few marvels left for the indefatigable rummagings of modern science to explain. Perhaps the predominant tendency of uneducated minds in the present day is rather to attribute effects to _false_ causes, than to leave them without any assignable cause. It is much easier for an unreasoning person to say that Tenterden steeple is the cause of Goodwin Sands, than to leave Goodwin Sands quite unaccounted for; or to say, the plant-lice suddenly appear crowding the rose-twigs, "the east wind has cast a blight," or "it is something in the air," than "I do not know how to account for their appearance." To a reflecting person, indeed, who weighs forces, the east wind appears as incompetent to the production of living animals as the tall tower to the origination of a sand-bank; and this, though he might be able to suggest nothing a whit more competent. What should he do in such a case? Manifestly this--test the actual existence and conditions of the phenomenon; see that it really has occurred; and, if the fact cannot be denied, admit it as a fact, and wait further light as to its causation. I do not by any means presume to declare the universal "why and because" of every familiar or unfamiliar occurrence: I leave that to more pretentious philosophers; smiling occasionally in my sleeve at the egotism which cannot see its own _non-sequiturs_. But still less can I consent to set aside every phenomenon which I cannot explain, with the common resource,--"Pooh! pooh! there must be some mistake!" Rather would I say, "There must still be some ignorance in me: near as I have reached to the summit of the ladder of knowledge, there must be still one or two rongs to be mounted before I can proclaim my mastery of all, absolutely _all_, the occult causes of things. Therefore, till then I must be content with the lowlier task of patiently accumulating evidence."