NATURE OF PLANTS ,, 



that are adapted to it. there is no need of farther crossine 

 Indeed we see many plants that flourish without crossing Owing 

 to the changes, however, that have occurred on the earth since 

 plants first appeared there has been a necessity for fertili/alion 

 in order that new combinations might arise and adapt the 

 ofTsprmg to the new conditions. 



10 



