39 



ably seriously influenced many animals, particularly those which fre- 

 quent mature forests, abounding in dead and dying trees and with an 

 abundance of logs upon the ground in all stages of decay. Such con- 

 ditions are the cumulative product of a fully mature climax forest. Of 

 course the conditions have also been influenced by the extinction, or 

 reduction in the number, of the original vertebrate population of the 

 forest. 



The different localities or regions examined are, for brevity and 

 precision, indicated by Roman numerals ; the particular minor condi- 

 tions, situations, or habitats, by italic letters. An effort has been made 

 to indicate the location of the place studied with enough precision to 

 enable students to re-examine the habitats at any future time (PL I). 

 The photographs which accompany this report may also aid in locat- 

 ing the places studied. Had similar photographic records been 

 made fifty years ago, they would have been of much value and inter- 

 est to us in this study, in much the same way as fifty years hence this 

 report will form a part of the very limited record of the conditions 

 found at the present time. 



List of Ecological Stations, Charleston, Illinois, August, ipio 



Station I. Prairie along the right-of-way of the Toledo, St. Louis and 

 Western, or "Clover Leaf"" R. R,, between one and two miles north 

 of Charleston: Section 2, Township 12 X.. Range 9 E.. and S. 35, 

 T. 13 X.. R. 9 E. (PL I.) 



a. Cord or Slough Grass (Spartina) and Wild Rye (Elymus) Asso- 

 ciation. At mile-post marked ' ' Toledo 318 miles and St. Louis 133 

 miles": S. 2. T. 12 X.. R. 9 E. 



b. Couch Grass (Agropyron smitliii) Association. The distance of 

 two telesrraph poles north of Station I, a, and west of the railway 

 track: S. 2, T. 12 E.. R. 9 E. 



c. Wild Eve (Elymus) Association. East and north of the "Yard 

 Limits"' sign: S. 2. T. 12 X., R. 9 E. (PL II, Fig. 1.) 



d. Swamp Milkweed (Asclcpias incarnata) Association. Xorth of 

 first east-and-west cross-road north of Charleston ; east of railway 

 track: S. 35. T. 13 X.. R. 9 E. A wet area. (PL II. Fig. 2 ; PL III, 

 Fig. 1.) 



e. Cone-flower (Lcpacli)is pinnata) and Rosin-weed (SUpMum tcre- 

 bintMnaceum) Association. Just north of the preceding Station; 

 east of railway track: S. 35, T. 13 X.. R. 9 E. (PL V.) 



/. Couch Grass (Agropyron smitliii) Association. West of railway 

 track: S. 35. T. 13 X.. R. 9 E. Moist area. 



g. Prairie Grass (Andropogon furcatus and A. virginicus and Spo- 

 robolus cryptandrus) Association, bordered by Swamp Milkweed 

 (Asclcpias incarnata) and Mountain Mint fPycnantliemum flex- 



