I have observed that children are rarely afraid of thunder unless the peals are really terrible and actually hurt the ear, otherwise this fear only comes to them when they know that thunder sometimes hurts or kills. When reason begins to cause fear, let us reassure them. By slow and careful stages man and child learn to fear nothing. In the dawn of life, when memory and imagination have not begun to function, the child only attends to what affects its senses. His sense experiences are the raw material of thought; they should, therefore, be presented to him in fitting order, so that memory may at a future time present them in the same order to his understanding; but as he only attends to his sensations it is enough, at first, to show him clearly the connection between these sensations and the things which cause them. He wants to touch and handle everything; do not check these movements which teach him invaluable lessons. Thus he learns to perceive the heat, cold, hardness, softness, weight, or lightness of bodies, to judge their size and shape and all their physical properties, by looking, feeling, [Footnote: Of all the senses that of smell is the latest to develop in children up to two or three years of age they appear to be insensible of pleasant or unpleasant odours; in this respect they are as indifferent or rather as insensible as many animals.] listening, and, above all, by comparing sight and touch, by judging with the eye what sensation they would cause to his hand. It is only by movement that we learn the difference between self and not self; it is only by our own movements that we gain the idea of space. The child has not this idea, so he stretches out his hand to seize the object within his reach or that which is a hundred paces from him. You take this as a sign of tyranny, an attempt to bid the thing draw near, or to bid you bring it. Nothing of the kind, it is merely that the object first seen in his brain, then before his eyes, now seems close to his arms, and he has no idea of space beyond his reach. Be careful, therefore, to take him about, to move him from place to place, and to let him perceive the change in his surroundings, so as to teach him to judge of distances. When he begins to perceive distances then you must change your plan, and only carry him when you please, not when he pleases; for as soon as he is no longer deceived by his senses, there is another motive for his effort. This change is remarkable and calls for explanation. The discomfort caused by real needs is shown by signs, when the help of others is required. Hence the cries of children; they often cry; it must be so. Since they are only conscious of feelings, when those feelings are pleasant they enjoy them in silence; when they are painful they say so in their own way and demand relief. Now when they are awake they can scarcely be in a state of indifference, either they are asleep or else they are feeling something.