An associational study of Illinois sand prairie . Figure -5. Lakes of the Illinois River flood-plain. QuiverLake and the Illinois River, vdiich are here con-fluent, a broad space to the belt of wil-lows. Beyond is Blagr Lake; beyond that isThomson s*^ Lake . At the horizon iz seen the eastbluff of the river. In high water one can rowacross the whole system of lakes, over the flooded boitorr>swhich separate 25 recent bed of the river has been cut out of the terrace which atHavana is thirty to fifty feet above the river. Physical Factors of the EnvironmentThe physical factors o
An associational study of Illinois sand prairie . Figure -5. Lakes of the Illinois River flood-plain. QuiverLake and the Illinois River, vdiich are here con-fluent, a broad space to the belt of wil-lows. Beyond is Blagr Lake; beyond that isThomson s*^ Lake . At the horizon iz seen the eastbluff of the river. In high water one can rowacross the whole system of lakes, over the flooded boitorr>swhich separate 25 recent bed of the river has been cut out of the terrace which atHavana is thirty to fifty feet above the river. Physical Factors of the EnvironmentThe physical factors of a land environment have been classifiedby Schimper (1903: 159-161) into tv/o groups - climatic factors whichoperate over very broad areas, and edaphic factors, which affect lo-cal modifications of the plant life (and the animal life as well) inany such broad region. The ecological type of the vegetation (whetterforest, grassland, or desert) is primarily dependent upon the climaticfactors, temperature, rainfall, and humidity of the air. The ecolo-gical type of the animal life is also dependent upon these factorsdirectly, and indirectly through adaptation to the ecological type ofvegetation; we may thus speak of forest or grassland animals just aswe speak of forest or grassland plants. The climate of Illinois favonithe growth of the deciduous forest (Gleason, 1910: 117; Schimper, 1903:162-175; Transeau, 1905). The s
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