Classroom Methods and Devices
The Elementary school journal
A study of the growth of Indian corn and of the many uses to which different parts of the plant are put forms one of the principal topics for study in natural science during the second half of the fifth school year. Previous work in institutional history has familiarized the child with the large part Indian corn played in the earliest American households. His interest in the raising of corn and in many of the products which are made from it is further enhanced by the fact that quite a number of
... t quite a number of these same products are readily prepared in the laboratory. It is also possible to obtain a large amount of free or inexpensive illustrative material which helps to emphasize to him in a concrete way the important part which corn plays in many present-day industries. For these reasons and because the average family is concerned in so many ways with corn and its products I have developed a series of twenty-six lessons using corn as a basis. To prevent needless duplication, that part of the course on corn which can be taught most readily in the foods laboratory is given by the teacher of home economics and omitted by the teacher of elementary science. In the accompanying sample pages from the fifth-grade general science outline the problems starred are some of those carried out by the teacher of home economics, the conspectus given in this article indicating the plan followed. The class to which this series is given meets twice each week, a half-hour recitation period being followed after several days by a laboratory period of an hour. Any new topic is usually discussed in the recitation period and a proper course of action decided upon; this is carried out in the following laboratory period. Sometimes a second recitation period is needed to finish a given discussion or 74 This content downloaded from 080.082.077.083 on January 11, 2018 17:52:37 PM All use subject to University of Chicago Press Terms and Conditions (http://www.journals.uchicago.edu/t-and-c CLASSROOM METHODS AND DEVICES 75 laboratory exercise. Rarely is anything done in the laboratory which has not been talked over in the class and a suitable method of procedure arrived at by the children and the teacher. A sufficient number of lessons is worked out in this article to indicate the method pursued. SELECTED TOPICS IN A SPECIAL ELEMENTARY SCIENCE COURSE FIFTH GRADE A. Study of Starch and Starchy Foods I. Problem: What are some of the properties (peculiarities) of starch? What can we find out about it? A. Hand pupils pieces of common starch, chalk, salt, and sugar. i. Color of starch. Compare with chalk. Mark on board with both. 2. Hardness. Scrape; drop on desk; break. 3. Brittleness. Rub between fingers-powders with a crackling noise. 4. Solubility. Compare with salt and sugar. a) Drop sugar and salt in water. Dissolves. b) Drop starch in water. Sinks. Why? c) Crush the starch in water-thick, milky, opaque solution. Why ? Set it aside. d) Pour boiling water on starch, a little at first. Add more, stir. Does starch dissolve ? e) Do the cold and hot starch solutions become clear on standing ? II. Problem: How can you tell starch from other substances? A. Have pupils make a pasty solution of starch and add a few drops of iodine to a part of it. Makes it blue. B. Test some chalk, salt, sugar with iodine.