MANUAL OF NATURE STUDY. 25 



food that a boy will eat? Will a horse? Why? 

 Will a horse leave his oats to drink cold water, or 

 hot coflFee or tea? Will a boy? Will a dog eat hot 

 potatoes and hot biscuits, and take a drink of cold 

 water to cool the burning mouth and stomach ? 

 Will a boy do that way ? Will a cat or dog leave 

 between his or her teeth particles of food to rot and 

 smell bad? Will some boys do that way ? Do cats 

 and dogs have toothache ? Do boys ? Grown up 

 boys? 



Conclusion to be reached : 



1. Teeth are used for biting and chewing food. 



2. Sudden changes of temperature crack the 

 enamel and thus cause decay. 



3. The use of tobacco is an injury to the teeth. 



4. Decaying particles of food gejierate an acid 

 that causes the teeth to decay. 



5. The teeth must be thoroughly cleansed after 

 each meal and immediately before retiring at night. 



6. In cleaning teeth a good tooth brush, or flan- 

 nel cloth, with clean water of same temperature 

 of mouth, should be used. 



4. — Lessons on the Bony Framework of the 



Body. 



Introduce this subject by a lesson on the umbrella, 

 and let the children discuss freely the use of the 

 stays and ribs.. As analagous topics, the children 



