Lee et 
Prof. Henry on the Conservation of Force. 35 
were brought to bear upon them. Let us further suppose the 
sun to cease giving emanations of any kind into space. The ra- 
again be called forth, vapor would rise from the ocean, clouds 
would be formed, rain would descend, and storms and tempests 
would resume their sway. 
_If the sun should again intermit its radiation, all these mo- 
tions would gradually diminish, and after a time entirely cease ; 
thing of this kind takes place in the northern and southern parts 
returned to the state of ice, and the surface of the earth is again 
in the same condition in which it was before it received the solar 
impulse. The energy of the solar vibrations communicated to 
the ice overcomes its cohesion, converting it into the liquid state, 
and the ice again becoming solid gives out the same amount 0 
heat in a less energetic form. Even the motive power of the 
wind is gross by the friction of its particles in producing an 
amount of heat equivalent to that which gave rise to its motion, 
Were enclosed in sacs filled with starch and other organic ingre- 
