VI 



' PACE 



The AndropogoH scopariits consocies -95 



The Sporobolns heterolepis - Sorghastnim Jiiitaiis consocies 300 



The Liatris scariosa association 301 



The Poa compressa association 303 



The Arctostaphylos-Juniperus heath association. ., 306 



The pine forest association 308 



The Quercus vehitina association 3^i 



The blowout associations 3^5 



The associations of the marsh habitats 3^8 



The plankton association 3^9 



The Chara association 3^9 



The Potamogetoii association 3^9 



The Castalia-Nymphaea association 320 



The RatiiDiculus aquaiilis capillacciis association 321 



The Lemna-Riccia association Z^'^ 



The Menyanthes-Sagittaria association 322 



The Carex association 324 



The Phragmites-Typha association 326 



The Scirpus validus association , 327 



The Scirpus aniericanus association 328 



The Cladium mariscoides association 329 



The Calamagrostis canadensis association . -ZiO 



The Iris versicolor association 332 



The Osmunda association 333 



The Poteiitilla fruticosa association 334 



The Liatris spicafa prairie association 335 



Tlie /uncus forreyi association 340 



The thicket associations : 



The P pulus-S alix-C ormis thicket association 340 



The Primus thicket association 342 



Transects of the associations 344 



General conclusions 34^ 



Summary 35 1 



Lists of the species of plants growing on the beacli area 353 



Bibliography of the more important works consulted 370 



ARTICLE VT. THE MIDSUMMER BIRD LIFE OF ILLINOIS: t\ 

 STATISTICAL STUDY. BY STEPHEN A. FORBES. Janu.vry, 



1913 373-385 



The area of observation 373 



General product of the survey 374 



Variation with latitude 375 



Migration waves 376 



Vegetation of the inspection area 378 



Numbers of birds l)y crops 379 



The meadow-lark 381 



Birds of the pastures 383 



ARTICLE VTI. OBSERVATIONS ON THE BREEDING OF THE 

 EUROPEAN CARP IN THE VICINITY OF HAVANA. ILLI- 

 NOIS. BY R. E. RICHARDSON. A.M. (Skf.tch of W.xters) 

 March. 1913 387-404 



Localities 387 



Equipment 389 



Journal of field observations. 1Q10-1911 ••389 



