426 SUGGESTIONS FOR TEACHERS 



or soft. Have them find whether it is cheaper to soften water with soap 

 or with washing powder, etc. 



Chapter IV. Have each student bake some biscuits by using the 

 baking chemicals as follows: 



(1) By using baking soda without any acid. 



(2) By using baking soda with sour milk. 



(3) By using baking soda with vinegar or hydrochloric acid. 



(4) By using baking powder with vinegar or sour milk. 



(5) By using baking powder without any acid. 



(6) By dissolving the baking powder in water and then mixing 



the solution with the material to be baked. 



Have the students bring their products to school and explain why 

 such different results were obtained. 



Chapter VI. The first assignment in this chapter should be as 

 follows: 



(1) Define stimulant. 



(2) Name some common stimulants. 



(3) Make a list of all the good effects which come from their 



habitual use. 



(4) Make a list of the evil effects which come from their habitual 



use. 



During the recitation have the students freely discuss the topics, 

 but with the teacher always in control. The teacher should present 

 additional facts and then let the students draw their own conclusion. 



Treat the subject of narcotics by the same method. 



Chapter XIX. Let the environment of the school determine to 

 what extent you require the students to master this chapter. Use 

 sufficient details to enable the students to understand the simple ma- 

 chines which they have already used. Always draw upon their experi- 

 ences and use these as a basis on which to build. Have them report on 

 where they have seen levers, inclined planes, pulleys, etc., used. Let 

 them explain how these machines were being used. 



Chapter XXXII. Have the students examine some soil and bring 

 some to class for more careful examination. Have students bring roots 

 of clover or similar plants and examine the tubercles. Have a student 

 make a report to the class on nitrogen compounds used for fertilizer. 

 Have them visit gardens and farms to see how soil is treated while 

 caring for plants. 



Chapter XXXIV. Have all students plant at home such seeds as 

 beans, pumpkin seeds, corn, peas, etc., in soil, sawdust, or sand to learn 

 how such seeds start to grow and to learn the necessary conditions for 

 healthy germination of such seeds.. In a village or' country high school 

 germinating tests of seeds should be made by taking six grains from 

 various places on an ear of corn and placing them in proper germinating 

 conditions. If all six grains grow the ear should be saved for seed. 



To make a seed germinating tester, take a box a foot or more square 

 and about two inches deep. Stretch wires across both ways, making 

 two-inch squares. Fill the box with soil up to the wires and cover the 



