Different explanations have been offered of this fear. Locke, who when writing on educational matters was rather hard on nurses and servants, puts down the whole of these fears to those wicked persons, “whose usual method is to awe children and keep them in subjection by telling them of Raw Head and Bloody Bones, and such other names as carry with them the idea of something terrible and hurtful, which they have reason to be afraid of when alone, especially in the dark”.[150] Rousseau on the other hand urges that there is a natural cause. “Accustomed as I am to perceive objects from a distance, and to anticipate their impressions in advance, how is it possible for me, when I no longer see anything of the objects that surround me, not to imagine a thousand creatures, a thousand movements, which may hurt me, and against which I am unable to protect myself?”[151] ----- Footnote 150: _Thoughts on Education_, sect. 138. Footnote 151: _Emile_, book ii. ----- Rousseau here supplements and corrects Locke. For one thing I have ascertained in the case of my own child, and in that of others, that a fear of the dark has grown up when the influence of the wicked nurse has been carefully eliminated. Locke forgets that children can get terrifying fancies from other children, and from all sorts of suggestions, unwittingly conveyed by the words of respectable grown people. Besides, he leaves untouched the question, why children when left alone in the dark should choose to dwell on these fearful images, rather than on the bright pretty ones which they also acquire. R. L. Stevenson has told us how happy a child can make himself at night with such pleasing fancies. Yet it must be owned that darkness seems rather to favour images of what is weird and terrible. How is this? Rousseau gets some way towards answering the question by saying (as I understand him to say) that darkness breeds a sense of insecurity. I do not, however, think that it is the inconvenience of being in the dark which generates the fear: a child might, I imagine, acquire it without ever having had to explore a dark place. I strongly suspect that the fear of darkness takes its rise in a sensuous phenomenon, a kind of physical repugnance. All sensations of very low intensity, as very soft vocal sounds, have about them a tinge of melancholy, a _tristesse_, and this is especially noticeable in the sensations which the eye experiences when confronted with a dark space, or, what is tantamount to this, a black and dull surface. The symbolism of darkness and blackness, as when we talk of ‘gloomy’ thoughts or liken trouble to a ‘black cloud,’ seems to rest on this effect of melancholy.