b. The flint and steel. 



Experiment 29. The flint and steel. 



c. The modern heat from friction the match. 



The proper care of matches. Danger from 

 mice. 



22. Heat from combustion. 



a. Complete combustion no smoke eco- 



nomical. 



b. Incomplete combustion smoky wasteful. 



Experiment 30. Complete and incom- 

 plete combustion. 



23. Combustibles and fuels. (See Section 73.) 



Experiment 31. The combustion of dif- 

 ferent materials. 



24. . Flames. 



Experiment 32. The cause of flame. 



25. First aid to the burned. 



Experiment 33. Drill for extinguishing 

 burning clothing. 



26. Conduction of heat. 



a. Good and poor conductors. 



Experiment 34. Good and bad conduct- 

 ors of heat. 



b. Why some objects feel warm and others feel 

 cokl although both are at the same temper- 

 ature. 



(This subject, Heat, is continued in the work for 

 the sixth grade.) 



