The little girls who make up the classes are not so far removed from their "playhouse" days that a survey of the dishes, stoves, and tables will not give them an eager desire to begin using them. This desire should be gratified, but as the use always necessitates the cleaning as well, it may be advisable at first to make use of the equipment only for the purpose of showing proper methods of cleaning. A short lesson on cleaning may be given in a few minutes, and the rest of the period spent in putting it into practice. The teacher may proceed somewhat as follows in the development of a lesson on cleaning: DEVELOPMENT OF A LESSON ON CLEANING MEANING OF CLEANING Take two dishes--plates or saucers--exactly alike. Have one clean and the other soiled with butter or some well-known substance. Ask the class the difference between them. One is clean and one dirty. What substance is on one that hinders your saying it is clean? Butter. What else could be on it? Jam. What else? Dust. What else? Gravy. Now instead of telling the name of the particular substance in each case, let us try to find one name that will apply to all of the substances which, as you say, make the dish dirty. Let us give these substances a name which will show that they do not belong to the plate. We may call each of them a foreign substance. And if I take the substance off the plate what am I doing to the plate? Cleaning it. Then what is cleaning? Cleaning is removing a foreign substance. METHODS OF CLEANING 1. _Scraping or rubbing away the foreign substance:_ What would you use to remove the butter from the plate? A piece of paper or a knife. What are you doing with the knife or paper? Scraping or rubbing off the foreign substance. Then how was it removed? It was removed by scraping or rubbing. Suppose some one has sharpened a pencil and let the pieces fall on the floor, what would you take to remove the foreign substance from the floor? A broom. What would you say you are doing with the broom? Sweeping. How does the movement of the broom over the floor compare with the movement of the knife over the plate? It is similar. What would you take to remove the dust from the window-sill? A duster. What would you say you are doing? Dusting. How does the movement of the duster compare with the movement of the knife and the broom? It is similar. In all of these cases of dish, floor, and sill, how did we remove the foreign substance? We scraped or rubbed it off. Name one way of removing a foreign substance. Scraping or rubbing it away. 2. _Dissolving the foreign substance and then scraping it away:_