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220 φημη idea has constantly been brought to my mind, nor do I see how the whole of the facts are to be explained except upon some such hypothesis. If we suppose that the sudden flurryings away of a band of small birds from the chaff-heap where they have been quietly feeding, are caused by the apprehension of danger, we may well credit the birds with having sharper senses than our own, though that they are often mistaken is shown by their almost immediate return, and also by as many of them (sometimes) remaining as fly away. But it is impossible to imagine that every individual bird of a large number, crowded together and busily feeding, can at the same instant of time see the same object, or even hear the same sound of alarm, unless very loud or conspicuous, nor can it be supposed that the same thought, producing the same action, can flash independently into all their minds at once, by mere chance. But if we suppose thought to be like a wind, sweeping amongst them and producing, each time that it rises to a certain degree of strength, its appropriate act, then we can understand fifty, seventy, or a hundred birds rising in this thought-wind, like leaves or straws blown up in a sudden gust, and, in the same way as when a blizzard or tornado bursts on a town, some frail objects in a room through which it has torn may be left standing, whilst everything else is strewed about in ruin, so may the thought-wave (to use the more familiar term) moving with inconceivable