PAPERS OX BIOLOGY AND AGRICULTURE 161 



TABLE 4. 



Total barberry shrubs found and removed in entire state: 



Number of Bushes in 



Bojth Sprouts 



Cities Country cities and country Found 

 and Re- on Re- 



Survey Towns Escaped Total Found moved survey 



Original 92500 25635 422S9 1347S9 S1S41 



Resurvey 



Removals 33056 2336 



Total 92500 25635 422S9 1347S9 114S9T 2336 



As previously mentioned, the first supposition that the 

 common barberry might find especially favorable condi- 

 tions for wild growth in calcareous situations has not 

 been substantiated by later experience. This is a con- 

 dition which should probably be expected since Schim- 

 per (9. p. 100) remarks especially concerning the varia- 

 tion of the flora found on calcareous soils, in that in 

 places plants may be found to be calciphilous, elsewhere 

 silicifilous, and elsewhere apparently indifferent. He 

 also notes (9. p. 100) that one species may be calciphilous 

 in one area, calciphobous in another, and indifferent in 

 yet a third. It may be doubted whether, in such cases, 

 chemical characters of the soil are of so much import- 

 ance as are associational or edaphic factors. 



In the eight counties of Illinois surveyed thus far for 

 barberry, there is apparent a correlation between the lo- 

 cation of escaped shrubs and the area once occupied by 

 our primeval forests (10). Maps 1-8, in which escaped 

 plantings are indicated, illustrate this fact and it may 

 also be seen that in a majority of cases the plantings are 

 located near the edge of the forested areas. It may be 

 thought that this fact is due to the majority of settle- 

 ments being located first upon the edges of timbered 

 areas; but in locations toward the interior of timber 

 areas where naturalized shrubs have been found, it is 

 constantly observed that they are on the edges of the 

 forest and present only when clearings are relatively 

 large. Only two plantings, each of a single shnib, are at 

 present known to occur in dense forest. Neither of the>e 

 is far removed from the forest's edge, and each appar- 

 ently is surrounded by secondary growth whose origin 

 is more recent than that of the barberiw. 



