$2 Wature'0 Airacle*. 



rapid, which causes the flow of colder air to be 

 quickened, and hence the increasing force of 

 the wind as the sun mounts higher in the 

 heavens. Eut when it has passed the point of 

 maximum heating intensity and the earth be- 

 gins to cool by radiation, the movements of air 

 currents begin to slow up, until along in the 

 evening a point is reached where the surface 

 of the earth and that of the ocean are of equal 

 temperature, and there is no longer any cause 

 for change of position in the air. 



The earth heats up quickly, and it also cools 

 quickly, especially if there is green grass and 

 vegetation. While they are poor conductors 

 of heat, they are excellent radiators, so that 

 when the sun's rays are no longer active the 

 earth cools down rapidly and soon passes the 

 point where there is an equilibrium between 

 the land and water. The water possesses the 

 opposite quality. It is slow to become heated, 

 because of a much larger mass that is affected, 

 and is equally slow to give up the heat. And 

 the consequence is that after the sun has set, 

 the land cools so much faster than the water 

 that we soon have the opposite condition, and 

 the sea is warmer than the land, which makefc 

 the air at that point lighter, and which in 

 turn causes the denser or colder air from the 

 land to flow toward the ocean, and displace 

 the lighter air and force it upward; hence we 

 have a land instead of a sea breeze. So that 



