To insure real ability to use the principle of space division which has just been developed, it will be necessary to give the class several problems which they may judge as a group. These in turn should be followed by other problems which will call for individual planning and the application of the principle in their solution. The number of such problems will vary with the class, but there should be enough to insure the desired ability. Furthermore, those given should be from as varied fields as possible so that the pupils will be able to make their own applications as needed. =Series of Suggested Problems to Test Pupils' Ability to Recognize and Use the Principle of Proportion Just Developed= [Sidenote: Judgment problems given for class solution] 1. "In which of these doors do you think the division into panels is most satisfactory? Why?" In this problem, as in the succeeding ones, the solution is not considered adequate unless each pupil can justify the choice she makes or the answer she gives according to the principle which was established in the earlier part of this lesson. 2. "On which of these book covers do you think the space is best divided? Why?" 3. "Small boxes have a variety of uses in our homes. These are all approximately the same in size. Which do you think has the most interesting relation between the depth of the lid and the depth of the box? Why?" 4. "Helen is planning to make a dress with a cape collar. Her mother thinks the collar is not deep enough and suggests that Helen change the pattern. How could she determine the most becoming depth for her cape collar?" 5. "Jane did not have enough cloth to make a dress without piecing it or buying more material. She decided to put a yoke in the waist. How deep on the waist do you think a yoke should come to be most attractive?" 6. "Mary has some 6-inch glass candlesticks at home. How can she determine the length of candle that would be most suitable when they are used on the buffet?" [Sidenote: Creative problem involving activity] 7. "Arrange the window shades so that the window space and the depth of the shade are pleasing in their relation to each other. Justify the arrangement you have made." [Sidenote: Judgment problem involving activity] 8. "Choose a girl with whom to work during the next few minutes. Check to see if the dresses you are wearing to-day have the belts so placed that each dress is divided as well as possible. Suggest any desirable changes for each other and justify each change." (At some time in the development and subsequent use of the principle established in this lesson it will be well to connect it with a previously established and closely related principle. Such a connection is made use of in the following problems.) [Sidenote: Creative problem involving use of a principle previously developed]