56 



Solar and Planetary Evolution. 



leaked away gravitation would draw together the particles 

 of vapor until a drop of water was formed, and so from in- 

 visible vapor our puff of steam would have become a visible 

 liquid. Behold a miracle ! Yet the explanation is simple. 



As the process of cooling continued, the drop of water 

 would become a substance of yet a different order, for there 

 would still be some heat left in the water, and this would 



jvig. l,— representing the equator of the solar atmosphere after it has aban- 

 doned a ring at the centrifugal limit, according to Laplace's theory. 



continue to escape into space, until finally, when the freez- 

 ing point was reached, the drop of water, through the action 

 of crystallization, would turn into a ball of ice. We should 

 thus see a puff of steam change from an invisible gas to a 

 vapor, from a vapor to a liquid, and from a liquid to a solid 

 body, and all through the simple process of cooling. 



The creation of a world is just as simple as that. Heat 



