The things that impress us, the things that we remember and apply, are the things to which we have attended wholly and completely. The mind may be thought of as a stream of energy. There is only so much volume, so much force that can be brought to bear upon the work in hand. In attention the mind's energy is piled up in a "wave" on the problem occupying our thought, and results follow as they cannot if the stream of mental energy flows at a dead level from lack of concentration.

Or, again, the mind's energy may be likened to the energy of sunlight as it falls in a flood through the window upon our desk. This diffuse sunlight will brighten the desk top and slightly increase its temperature, but no striking effects are seen. But now take this same amount of sun energy and, passing it through a lens, focus it on a small spot on the desk top—and the wood bursts almost at once into flame. What diffuse energy coming from the sun could never do, concentrated energy easily and quickly accomplished. Attention is to the mind's energy what the lens is to the sun's energy. It gathers the mental power into a focus on the lesson to be learned or the truth to be mastered, and the concentrated energy of the mind readily accomplishes results that would be impossible with the mental energy scattered or not directed to the one thing under consideration. The teacher's first and most persistent problem in the recitation is, therefore, to gain and hold the highest possible degree of attention.

Three types of appeal to attention.—We are told that there are three kinds of attention, though this is not strictly true. There is really only one kind of attention, for attention is but the concentration of the mind's energy on one object or thought. What is meant is that there are three different ways of securing or appealing to attention. Each type of attention is named in accordance with the kind of compulsion or appeal necessary to command it, as follows:

1. Involuntary attention, or attention that is demanded of us by some sudden or startling stimulus, as the stroke of a bell, the whistle of a train, an aching tooth, the teacher rapping on the desk with a ruler.

2. Nonvoluntary, or spontaneous, attention that we give easily and naturally, with no effort of self-compulsion. This kind of attention is compelled by interest, and, when left unhindered, will be guided by the nature of our interest.

3. Voluntary attention, or attention that is compelled by effort and power of will, and thereby required to concern itself with some particular object of thought when the mind's pull or desire is in another direction.

How each type of attention works.—The first of these types of attention, the involuntary, has so little place in education that we shall not need to discuss it here. The teacher who raps the desk, or taps the bell to secure attention which should come from interest must remember that in such case the attention is given to the stimulus, that is, to the signal, and not to the lesson, and this very fact makes all such efforts to secure attention a distraction in themselves.

The spontaneous, or nonvoluntary, attention that arises from interest is the basis on which all true education and training must be founded. The mind, and especially the child's mind, is so constituted that its full power is not brought to bear except under the stimulus and compulsion of interest. It is the story which is so entrancing that we cannot tear ourself away from it, the game which is so exciting as to cause us to forget all else in watching it, the lecture or sermon which is so interesting that we are absorbed in listening to it, that claims our best thought and comprehension. It is when our mind's powers are thus driven by a tidal wave of interest that we are at our best, and that we receive and register the lasting impressions which become a part of our mental equipment and character.

This does not mean, however, that there is no place for voluntary attention in the child's training. For not everything can be made so inviting that the appeal will at all times bring about the concentration necessary. And in any case a part of the child's education is to learn self-direction, self-compulsion, and self-control. There are many occasions when the interest is not sufficient to hold attention steady to the task in hand; it is at this point that voluntary attention should come in to add its help to provide the required effort and concentration. There are many circumstances under which interest will secure a moderate amount of application of mental energy to the task, but where the will should step in and command an additional supply of effort, and so attain full instead of partial results.

Children should, therefore, be trained to give attention. They should be taught to take and maintain the attitude of attention throughout the lesson period, and not be allowed to become listless or troublesome the moment their interest is not held to the highest pitch.