UNIT 



VII 



HOW LIVING THINGS AFFEGT ONE 

 ANOTHER 



Fig. 323 'I runt lishiu}^ in l.'olorado. This photoij^raph shows one of the relationships 

 of man to other animals. Can you think of some of the relationships of the trout to 

 other animals and plants in the streain and alongside it? What might man do, besides 

 fishing, to change some of these relationships? (aultman studio) 



