b. Other examples of spontaneous combustion. 



33. Clothing. (See Section 96.) 



a. Kinds of clothing. 



Experiment 33. The flame test for cot- 

 ton and wool. 



b. Uses of clothing. The dangers from too 

 much clothing. 



34. Heat kills bacteria. 



a. Pasteurizing. 



b. Purification by boiling. Its limitations. 

 (This subject, Heat, is continued in the work 

 for the seventh grade.) 



AIR. VI. 



35. A brief summary of the facts stated under the 



same topic in the work for the fifth grade. 



36. Drafts in stoves.. 



b. How to use them properly. 



37. Ventilation. 



a. Convective. 



Experiment 34. Ventilation in a chalk 

 box. 



b. Forced. 



38. Dangers from impure air. 



a. Temporary results. 



b. Permanent results. 



39. Tests for bad air. (See Section 98.) 



a. By odor. The limitations of the sense of 

 smell. 



b. By chemicals. 



Experiment 35. To test the air of a room. 



40. The warming of the atmosphere. 



