THE AT^rOSPHERE. 53 



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 V 



What is frost? AVhen is frost liable to occur, and wliLn 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 ? AMiat is the work of the 

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

 vantage is it to the farmer? AMiat 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 ? AVhat tlii'ee general conditions deter- 

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

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

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

 determines the amount of rain in any locality? 



