H A P T E R XII THE TECHNIQUE OF LESSONS FIRST PERIOD: INITIATIONS Isolating the Object. The mistress, when she is giving a lesson, or wants to help the child to use the sense-material, regards it as being essential that the attention of the child should be isolated from everything except the object of the lesson; to that end, she will be careful to clear a table of all else and place upon it only the material which she wishes to present. Working exactly. The help which" the mistress has to give consists in presenting to the child the material so as to show him how to use it, performing the exercise herself once or iwice; for example: displacing the cylinders of the solid insets, mixing them up and putting them back in position by trial; or mixing up the colour spools to be matched up, then taking one of them by chance in the proper way without touching the silk, and placing it alongside the identical spool; and so on. Sousing Attention. When the mistress offers the object to the efeild she must never do it coldly, but must display some vivacious interest as she calls the attention of the child to it.