4 ZOOLOGY 



necessarily, the totality of energy; but this energy 

 may cease to produce any appreciable phenomena 

 without being destroyed. Physicists suppose that 

 conceivably the whole universe might (or, some say, 

 will) "run down," so that all its energy will be in 

 forms producing no chemical or physical ''phenomena," 

 and thus practically non-existent from a human 

 standpoint. No one knows how such an inert universe 

 could be started up again, but the translation of energy 

 from latent to active forms is familiar, and without it 

 there could be no life. Life exists because oscillation 

 or alternation between the two states of energy is 

 possible. 



