Have you eaten it all?
Children.—No, Signora.
Now let us go into the courtyard and throw away the rest of the snow. Then we will put the boxes on this table to dry. And to-morrow I will show you a pretty picture of country covered with snow. Come along; bring your boxes, and when you have emptied them put them back where I told you."
I intend to repeat this lesson in another form, combining others with it, and referring in it to other ideas, which bear a relation to that here set forth.
As everything in the physical and moral world is one and indivisible, bound together in closest union, human development is gravely impeded by the presentment of isolated educational facts in a desultory manner, because it is impossible to disconnect things united by a sacred and eternal law.
In the above "model" lesson, it is claimed that only two perceptions are dealt with, those of cold and heat, and that the child has been allowed a good deal of liberty, but of a judicious kind.
Now it would be exceedingly difficult to limit the perceptions strictly to two, especially when dealing with persons placed in an environment abounding in stimuli, who have already stored up a whole chaos of images. But such being the object in view, it is necessary to eliminate as far as possible all other perceptions, to arrest those two, and so to polarize attention on them that all other images shall be obscured in the field of consciousness. This would be the scientific method tending to isolate perceptions; and it is in fact the practical method adopted by us in our education of the senses. In the case of cold and heat, the child is "prepared" by the isolation of the particular sense in question; he is placed blindfolded in a silent place, to the end that thermic stimuli alone may reach him. In front of the child are placed two objects perfectly identical in all characteristics perceptible to the muscular tactile sense: of the same dimensions, the same shape, the same degree of smoothness, the same resistance to pressure; for instance, two india-rubber bags, filled with the same quantity of water, and perfectly dry on the outside. The sole difference is the temperature of the water in the two bags; in the hot one, the water would be at a temperature of sixty degrees centigrade; in the cold, at ten degrees centigrade. After directing the child's attention to the object, his hand is drawn over the hot bag, and then over the cold one; while his hand is on the hot bag the teacher says: It is hot! While he feels the cold one he is told: It is cold. And the lesson is finished. It has consisted merely of two words, and of a long preparation designed to ensure that as far as possible, the two sensations corresponding to these two words shall be the only ones that reach the child. The other senses, sight and hearing, were protected against stimuli; and there was no perceptible difference in the objects offered to the touch save that of temperature. Thus it becomes approximately probable that the child will achieve the perception of two sensations exclusively.
And what about the liberty of the child, we shall be asked?