FIG. 33. Sassafras, clog-wood, and wild crab- 

 apple competing- for dominance. 



FIG-. 34. 



Wild crabapple is common on less 

 eroded parts of field. 



FIG. 36. Green ash shooting* up from rough 

 sod to take over sunlight and soil. 



PIGS. 27-37 



An old field usually presents many micro-cli- 

 mates, many micro-landscapes, many stag-es 

 of succession. Present also are many varieties 

 of animal habitat and many orders of animals 

 according- to the variations in the landscape. 



FIG. 35. Sumac taking- advantage of soil im- 

 provement by preceding life. 



FIG. 37. Oak overcoming competition of many 

 lower species where soil is good. 



