324 



A NATURALIST IN THE GREAT LAKES REGION 



Plankton, food of fish, 109 



Platteville-Galena limestone 



Polyzoan, Pcdinella magnifica, 240 



Ponds: filling of, 15, 16, 167, 232; in 

 dunes, 167, 179; first type, 168, 179; 

 second type, 182, 183; third type, 

 179, 193, 194 



Ponds, temporary, life of, 92 



Pondweed, Potamogeton 



Porphyr}^ 74 



Pot holes, 86 



Potsdam formation, 46, 47 



Prairie, 179, 242, 245 



Predatory beetle association, 150 



Preglacial river system, 58 



Proterozoic, 30, 31, 41 



Puccoon, Lithospermum canescens 



Pyrite, 72 



Pyroxene, 72 



Quarries, 36, 37, 45 



Quartz, 68, 69, 73 



Quartzite, 40 



Queen Anne's lace, Daucus Carota 



Rabbit, wild, see Mammals 

 Railroads, routes determined by, 88 

 Rain, an erosion agent, n, 27 

 Rainfall, effect on plant distribution, 95, 



96, 97 

 Rattlebox, Crotalia sagUtalis 

 Rattlesnake master, Eryngium yucci- 



folium 

 Rattlesnake root, Prenanthes alba 

 Ra\dne: clay, 4, 259; formation of, 3, 



5, 6, 261; rock, 6, 7, 263 



Reptilia, Snakes, Turtles: 



— Aromochelys odorata, musk turtle, 



178, 239 

 — Aspidonectes spinifer, soft-shelled 



turtle, 23g 

 — Chelydra serpentina, snapping turtle, 



240 

 — Chrysemus marginaia, painted turtle, 



239, 240 

 — Cnemidophorasexlineatiis, sand lizard, 



99, 160, 161 

 — Coluber constrictor, blue racer, 161 



— Grapfemys geographicus, geographic 

 turtle, 23g 



— Hcterodon platirhinos, hog-nosed 

 snake, 162 



— LeiopeUis vernalis, prairie green snake, 



25s 



— Thamnopkis radix, prairie garter 

 snake, 255 



Rice, wild, Zizania aquatica 



Richmond shale, 34, 38, 47, 52, 58 



Rivers, action of, 3, 27 



River bottom association, 271 



Rock: dumps, 12 



Rocks, 68; Chicago region, 38, 43; earh- 

 ept, 25, 29, 39; igneous, 73; forma- 

 tion, 17, 28, 44; metamorphic, 39, 

 40, 76; Plutonic, 7^; sedimentary, 

 17, 28, 29, 70; systems of, 31, 38; 

 table of, 75; volcanic, 73 



Rock River, 6, 54 



Rosin weed, Silphium terebinthinaceum 



Rotifers, 288 



Rotting log association, 225 



Rush, bog, J uncus, several species 



Rush, spike, Eleocharis acicularis 



Sag Station, 8, 78 



St. John's-wort, Hypericum Kalmianum 



St. Peter's sandstone, 34, 38, 46, 54 



Salt Creek, 3, 4, 83 



Sandbars, 113 



Sarsaparilla, Aralia niidicaulis 



Sawfly, 257 



Saxifrage, swamp, Saxifraga penn- 

 sylvanica 



Schist, 4.0, 76 



Sea rocket, Cakile edentula 



Seas, epicontinental, 44 



Seasonal distribution of plants, 92, 



248 



Sedges, see Carex 

 Sedimentation, 28 

 Serpentine, 71 

 Shale, 46, 76 



