H A P T E R XXVU SEQUENCE AND GRADES IN THE PRESENTATION OF THE MATERIAL Iisr the practical application of the method it is necessary to know 'the serial arrangement of the exercises, which must be presented in succession to the child. In the course of this book there has been indicated a progressive course for every exercise. But in the Children's Houses, the most varied exercises are begun at the same •time, and it happens that there exist grades in the presentation of the material in its entirety. That is indicated as follows: FIRST GRADE Practical life: moving chairs silently, carrying objects* walking • on the points of the feet. Fastening up. The solid insets (sense exercises)* Within the group of the insets is found the following gradation from easy to difficult— (a) Insets of the same height and decreasing diameter. (b) Insets decreasing in all dimensions. (c) Insets decreasing only in height.