HEAT AND COLD. 



again by the dispersed matter from the side exposed 

 to the heat. 



The moon moves from west to east, on its axis, by 

 the action of the sun upon the body. While the moon 

 is moving beyond the earth or during the period when 

 it is situated more distant from the sun, it continues to 

 pile up the particles of matter detached from the por- 

 tion exposed to the action of the sun. All the while 

 the cold precipitating the particles on the portion of 

 the body directed away from the sun and the sun ex- 

 panding the portion nearer to the same until the 

 equilibrium has been destroyed and in the course of a 

 revolution the displacement is sufficient to cause one 

 revolution of the moon on its axis from west to east. 

 The reason why the moon does not revolve faster can 

 be attributed to the fact of there being very little elas- 

 tic matter that can be carried from one side of the 

 body to the other. The main factor in a body like the 

 moon being the compression on the portion exposed to 

 the cold, and the expansion on the side exposed to the 

 action of the sun. Between the two forces it brings 

 about sufficient weight in difference to cause it to re- 

 volve once in a revolution around the earth. Of course 

 aided by what little moisture there is within the body 

 being carried away and precipitated on the other side. 



The polar revolution is brought about by the ac- 

 tion of the earth reflecting the rays of the sun, and 

 being in the premises like a young sun in the heavens 

 with regard to action upon the particles of the moon. 

 The earth bringing to bear great heat on the side ex- 



226 



