Floristik, Geographie, Systematik etc. 123 



1. Colon}'^ of swamp grasses {Spartina and Elymus), Station la. 



2. Colony of wild rye {Elytnus virgüiiaca submuticus) , Station Ic. 



3. Wet area of swamp milkweed {Asclepias hicarnata), Sta- 

 tion Id. 



4. Cone-flower and rosin-weed colony, Station le. 



5. Colony of blue stem {Andropogon) and drop seed [Sporo- 

 bohts) bordered by swamp milkweed, Station Ig. 



6. Supplementary collections from Station I. 

 II. Prairie area near Loxa, Illinois, Station IL 



III. Prairie area east of Charleston, Station IIL 



1. The Bates woods, Station IV. 



2. The upland oak-hickory forest, Station IVa. 



3. Embarras Valley and ravine slopes forested by the oak- 

 hickor}^ association, Station IVb. 



4. Lowland or "second bottom". red oak-elm-sugar maple 

 woodland association, Station IVc. 



5. Supplementary collections from the Bates woods, Station IV. 



6. Small temporary stream in the south ravine, Station IVd. 

 General characteristics of the grass environment. 



1. Topography and soils of the State. 



2. Climatic conditions. 



3. Climatic centers of influence. 



4. Relative humidity and evaporating power of the air. 



5. Temperature relations in the open and in forests. 



6. Soll moisture and its relation to Vegetation. 



7. Ventilation of land habitats. 



8. The tree trunk as a habitat. 



9. Prairie and forest Vegetation and animal life. 



10. Source and röle of water, used by prairie and forest animals. 

 Animal Associations of the prairie and the forest. 

 I. Introduction. 

 II. The prairie association. 



1. Swamp prairie association. 



2. The cottonwood Community. 



3. Swamp-grass association. 



4. Low prairie association. 



5. Upland prairie association. 



6. The Solidago Community. 



7. Dry prairie grass association. 



8. A milkweed Community. 



III. Relation of prairie animals to their environment. 



1. Black soil prairie Community. 



2. The prairie Vegetation Community. 



3. Interrelations within the prairie association. 



IV. The forest associations. 



1. Introduction. 



2. Dry upland [Qnercus and Carya) forest associations. 



3. Artificial glade Community in lowland forest. 



4. Humid lowland (hard maple and red oak) forest association, 



5. Animal association of a temporary stream. 



V. Relation of the deciduous forest invertebrates to their envi- 

 ronment. 



1. Forest soil Community. 



2. Forest fungus Community. 



3. The forest undergrowth Community. 



4. The forest crown Community. 



