12 PLANT SUCCESSION AND CROP PRODUCTION 



able to believe that a study of the relation between soils and the 

 plants growing in them based on the conceptions of the develop- 

 ment of the vegetation would be of great benefit. There are already 

 studies in progress in several parts of the country on the indicator 

 significance of the vegetations to such practical ends as the location 

 of future forest sites and the possible crops yields of the future. 

 These investigations mark an important, if thus far only a slight, 

 step in the advance of learning. They indicate a new cooperation 

 among scientists as well as unification of the results of studies in 

 scientific theories and the adjustment possible between these and 

 human welfare. 



