Similar lessons may be given with the series of graduated prisms, of rods, and of cubes. The prisms are thick and thin and of equal length. The rods are long and short and of equal thickness. The cubes are big and little and differ in size and in height.
The application of these ideas to environment will come most easily when we measure the children with the anthropometer. They will begin among themselves to make comparisons, saying, "I am taller,—you are thicker." These comparisons are also made when the children hold out their little hands to show that they are clean, and the directress stretches hers out also, to show that she, too, has clean hands. Often the contrast between the dimensions of the hands calls forth laughter. The children make a perfect game of measuring themselves. They stand side by side; they look at each other; they decide. Often they place themselves beside grown persons, and observe with curiosity and interest the great difference in height.
Form. When the child shows that he can with security distinguish between the forms of the plane geometric insets, the directress may begin the lessons in nomenclature. She should begin with two strongly-contrasted forms, as the square and the circle, and should follow the usual method, using the three periods of Séguin. We do not teach all the names relative to the geometric figures, giving only those of the most familiar forms, such as square, circle, rectangle, triangle, oval. We now call attention to the fact that there are rectangles which are narrow and long, and others which are broad and short, while the squares are equal on all sides and can be only big and little. These things are most easily shown with the insets, for, though we turn the square about, it still enters its frame, while the rectangle, if placed across the opening, will not enter. The child is much interested in this exercise, for which we arrange in the frame a square and a series of rectangles, having the longest side equal to the side of the square, the other side gradually decreasing in the five pieces.
In the same way we proceed to show the difference between the oval, the ellipse, and the circle. The circle enters no matter how it is placed, or turned about; the ellipse does not enter when placed transversely, but if placed lengthwise will enter even if turned upside down. The oval, however, not only cannot enter the frame if placed transversely, but not even when turned upside down; it must be placed with the large curve toward the large part of the opening, and with the narrow curve toward the narrow portion of the opening.
The circles, big and little, enter their frames no matter how they are turned about. I do not reveal the difference between the oval and the ellipse until a very late stage of the child's education, and then not to all children, but only to those who show a special interest in the forms by choosing the game often, or by asking about the differences. I prefer that such differences should be recognised later by the child, spontaneously, perhaps in the elementary school.
It seems to many persons that in teaching these forms we are teaching geometry, and that this is premature in schools for such young children. Others feel that, if we wish to present geometric forms, we should use the solids, as being more concrete.
I feel that I should say a word here to combat such prejudices. To observe a geometric form is not to analyse it, and in the analysis geometry begins. When, for example, we speak to the child of sides and angles and explain these to him, even though with objective methods, as Froebel advocates (for example, the square has four sides and can be constructed with four sticks of equal length), then indeed we do enter the field of geometry, and I believe that little children are too immature for these steps. But the observation of the form cannot be too advanced for a child at this age. The plane of the table at which the child sits while eating his supper is probably a rectangle; the plate which contains his food is a circle, and we certainly do not consider that the child is too immature to be allowed to look at the table and the plate.
The insets which we present simply call the attention to a given form. As to the name, it is analogous to other names by which the child learns to call things. Why should we consider it premature to teach the child the words circle, square, oval, when in his home he repeatedly hears the word round used in connection with plates, etc. He will hear his parents speak of the square table, the oval table, etc., and these words in common use will remain for a long time confused in his mind and in his speech, if we do not interpose such help as that we give in the teaching of forms.
We should reflect upon the fact that many times a child, left to himself, makes an undue effort to comprehend the language of the adults and the meaning of the things about him. Opportune and rational instruction prevents such an effort, and therefore does not weary, but relieves, the child and satisfies his desire for knowledge. Indeed, he shows his contentment by various expressions of pleasure. At the same time, his attention is called to the word which, if he is allowed to pronounce badly, develops in him an imperfect use of the language.
This often arises from an effort on his part to imitate the careless speech of persons about him, while the teacher, by pronouncing clearly the word referring to the object which arouses the child's curiosity, prevents such effort and such imperfections.