80 [EVOLUTION 



the roots; whereas ajiimfrls obtain their 



from tVi^ nm^plex pro- 



fprrnerl within other organisms. Most 

 plants, therefore, feed at a lower chemical 

 level than do animals, and it is characteristic 

 of them that, in the reduction of carbon 

 dioxide and in the manufacture of starch 

 and proteids, fK^ Vincd-iV pn^rgy of 



y the ^v^g matter "into 



potential PJ]f>rmVfl1 pn^rgy nf rnrnp]^y food- 



stuffs. Animals, on the other hand, get their 

 food ready-made; they take the pounds 

 which plants have, as it were, accumulated 

 in pence, and they spend them. For it is 

 characteristic ..of animals that 



sively convert, tli P pot.p.D.t.in.Lf*.TiP!TmVn.l 



^ 



mofihn n.nd nthor artivities tn sEortTThe 

 great distinction an average one at best 

 is that most animals are more active than 

 most plants. 



Changing the point of view a little, we may 

 notice that, because of their mode of .mir 

 typiVa.1 am'rrmlc are bound to be 

 in 



Similarly we may say that the plant- 

 cell, by shutting itself up in a wall of cellulose, 

 instead of fully oxidizing this substance, 

 and perhaps also by less efficient elimination 

 of nitrogenous waste, doomed itself to fixity 



