Stored ;6ner0B in Mater. 187 



vapor again. Yet this does not hinder the 

 same process from going on at the surface of 

 the earth wherever there is water or moisture. 

 But they tell us that the electroscope does not 

 show any signs of electrification in the evap- 

 orated moisture. Of course it does not. The 

 electroscope is not made to detect the presence 

 of energy except when set free as electricity. 



A wound-up spring does not seem to be elec- 

 trified, but if it is released the energy stored in 

 it will be transformed into electricity if the 

 conditions are right. Just so, the energy re- 

 quired to put the moisture spherule into a 

 state of strain is latent until some power re- 

 leases it, when it reappears as active energy of 

 some form. 



We have now followed the relation of heat 

 to water from a point 10 degrees below freez- 

 ing up to where it was forced into its original 

 gases, oxygen and hydrogen. These gases 

 have stored in them a wonderful amount of 

 potential energy. When one pound of hydro- 

 gen and eight pounds of oxygen unite to form 

 water the mechanical value of the energy 

 given up at that time in the form of heat is 

 represented by 47,000,000 pounds raised to one 

 foot in height. And this is the measure of the 

 energy that was put into nine pounds of water 

 to force it from a state of vapor into its con- 

 stituent gases. After the combination of the 

 gases into a state of vapor the temperature 



