THE SUBJECT MATTER OF ECOLOGY 



19 



i *V- ' 







predominate. (3) Portion of a shrub community made up largely of rhodo- 

 dendron (open coniferous forest in background). (4) Moss community in 

 which young conifers are becoming established.— Photos by D. M. Brown. 



with opportunities to observe natural variation on a large scale and 

 under a variety of circumstances, must have contributed to de- 



