THE ATMOSPHERE. 



effect of a slight breeze ? Give some idea of the quantity of dew. 

 What causes drops of water to form upon a pitcher of cold water 

 on a hot day ? 



What is frost ? When is frost liable to occur, and when not ? Upon 

 which side of a window does frost form ? Why is there less frost 

 on the windows of a vacant room than on those of a room full of 

 people ? 



Are the changes of weather accidental ? What is the work of the 

 Weather Bureau, established by the government? Of what ad- 

 vantage is it to the farmer? What is the general cause of a 

 storm ? Describe the general course of storms in the United States. 

 Which way do the winds naturally blow at the time of a storm, 

 and why? 



What is meant by climate ? What three general conditions deter- 

 mine the temperature of a locality ? Why is the temperature over 

 the ocean more uniform than over the land ? Why are winters 

 usually most severe in the center of a continent ? What generally 

 determines the amount of rain in any locality ? 



