_Exercises with the Colour-tablets._ For the earliest of these exercises, we select three strong colours: for example, _red_, _blue_, and _yellow_, in pairs. These six tablets we place upon the table before the child. Showing him one of the colours, we ask him to find its duplicate among the mixed tablets upon the table. In this way, we have him arrange the colour-tablets in a column, two by two, pairing them according to colour.
The number of tablets in this game may be increased until the eight colours, or sixteen tablets, are given at once. When the strongest tones have been presented, we may proceed to the presentation of lighter tones, in the same way. Finally, we present two or three tablets of the same colour, but of different tone, showing the child how to arrange these in order of gradation. In this way, the eight gradations are finally presented.
Following this, we place before the child the eight gradations of two different colours (red and blue); he is shown how to separate the groups and then arrange each group in gradation. As we proceed we offer groups of more nearly related colours; for example, blue and violet, yellow and orange, etc.
In one of the "Children's Houses," I have seen the following game played with the greatest success and interest, and with surprising _rapidity_. The directress places upon a table, about which the children are seated, as many colour groups as there are children, for example, three. She then calls each child's attention to the colour each is to select, or which she assigns to him. Then, she mixes the three groups of colours upon the table. Each child takes rapidly from the mixed heap of tablets all the gradations of his colour, and proceeds to arrange the tablets, which, when thus placed in a line, give the appearance of a strip of shaded ribbon.
In another "House," I have seen the children take the entire box, empty the sixty-four colour-tablets upon the table and after carefully mixing them, rapidly collect them into groups and arrange them in gradation, constructing a species of little carpet of delicately coloured and intermingling tints. The children very quickly acquire an ability before which we stand amazed. Children of three years are able to put all of the tints into gradation.