V 



PAGE 



Sand lands 230 



Planting 231 



Growth figures 231 



Forest protection 234 



Fire 234 



Methods of fighting fires 237 



Grazing 240 



Prevention of disease and insect injury 240 



A forest policy for the state 241 



A proposed forest law 242 



Bibliography relating to forest conditions of Illinois 250 



ARTICLE V. THE VEGETATION OF THE BEACH AREA IN 

 NORTHEASTERN ILLINOIS AND SOUTHEASTERN WISCON- 

 SIN. BY FRANK CALEB GATES. A.B. (20 Plates) March, 1912. .255-372 



Introduction 255 



Location and physiography 256 



Physiographical history 257 



Climate 259 



Edaphic factors 259 



Influence cf Lake Michigan 260 



General description of the region 261 



Associations : general considerations 262 



The lower and middle beach associations 266 



The Chlamydomouas association 266 



The Cakile-Xaiithiitm association 269 



The middle-beach pool associations 273 



The Juiiciis alpinus iiisigiiis association 273 



The Triglochin palustris association 274 



The Carex (rderi pumila - Cy penis rivularis association 274 



The Sabatia-Linum association 275 



The J uncus balticiis litt oralis association 276 



The Potentilla anserina association 278 



The dune formation 280 



The dune associations 282 



The Calamovilfa dime association 282 



The Ammophila arcnaria dune association 2R3 



The Salix syrticola dune association 285 



The Primus pumila dune association 286 



The Po pubis candicaus dune association 287 



The Elyinus canadensis dune association 287 



The Junipcrus dunes association 288 



Miscellaneous dunes 289 



The Populus-Salix dune association 289 



The Salix glaucophylla dune association 290 



The Panicum virgatum dune association 290 



The Andropogon scoparius dune association 291 



The Populus-Salix-Cornns thicket dune association 291 



The Bctula alba papyri f era dune association 291 



Relic dunes 292 



The man-made dime 292 



The traveling dune 293 



Tlie upper beach associations : 



The Art emisia-P anicum association 293 



The bunch-grass association 295 



