a. Direct heating. 



b. Reflected heating. 



c. Heating by convection. 



41. The cause of winds. 



Experiment 36. The weather vane. 

 (See Section 88.) 



42. The work of the winds. 



a. Effects on surface of the earth. 



b. The wind wheel. 



Experiment 37. How to make a wind 



wheel. 

 Experiment 38. How to make a good 



kite. 



c. The velocity of the winds (See Section 88.^ 



43. The weight of the atmosphere. 



Experiment 40. To^ show that air has 

 weight. (No air pump is needed.) 



44. The pressure of the atmosphere. (See Section 



97.) 



a. Equal in all directions. v 



Experiment 41. Pressure of the atmos- 

 phere equal in all directions. 



Experiment 42. An inverted glass of 

 water. 



b. The amount of the atmospheric pressure. 



45. The barometer. (See Section 88.) 



Experiment 43. How to make a barom- 

 eter. 



46. The weather and climate. 



a. Fair, cloudy, or rainy. 



b. The direction and strength of the wind. 

 c.. The temperature; morning, noon, and even- 

 ing. 



