LIST OF ILLUSTRATIONS 



XV 



PAGE 



8i 



83 



84 



85 

 86 



Fig. 50. — ^Lakes Chicago, Saginaw, and Maumee 



Fig. 51. — Lake Chicago at a Later Stage and Lake Warren 



Fig. 52. — Lake Algonquin 



Fig. 53. — Map Showing Successive Shore Lines of Lake Chicago 

 Fig. 54. — Grooves and Potholes in Bed of Outlet of Lake Chicago 



Chapter VI 



Fig. 55. — Spring Flowers of the Forest Floor 91 



Fig. 56. — Fresh- Water Crustaceans 93 



Fig. 57. — Map Showing Relation of Rainfall to Evaporation in 



Eastern United States 95 



Fig. 58. — Map pf Forest, Prairie, and Plains Regions in Eastern 



United States 96 



Fig. 59. — Diagram of Rates of Evaporation in Contiguous Regions 



(Adams) 97 



Fig. 60. — The Cactus of the Dunes, Opuntia Rafinesquii ... 98 



Fig. 61. — The Six-lined Lizard, Cnemidophorus sexlineatus . . 99 



Fig. 62. — Relative Evaporation Rates in the Strata of the Forest . 100 



Fig. 62). — Wild Lettuce, Lactuca scariola loi 



Fig. 64. — Dissected Leaves of Bladderwort, Hornwort, and Milfoil; 



Utricularia, Ceratophyllum, Myriophyllum . . .103 



Fig. 65. — Closed Gentian, Gentiana Andrewsli 107 



Fig. 66. — Cup on Stem of Silphium perfoliatum . . . .108 



Fig. Gy.— Digger Wcisp, Bembex spinolae no 



Chapter VII 



Fig. 68. — Newly Formed Sand Bar Offshore in Dunes . . -113 

 Fig. 69. — Small Dunes Held by Prostrate Juniper, Juniperus 



horizontalis 114 



Fig. 70. — Panne at Miller 115 



Fig. 71. — Double Row of Seedlings. Same Two Years Older . .116 



Fig. 72. — Sea Rocket, Ca^f/e ^(/e/^/z^/a 117 



Fig. 73. — Bugseed, Corispermum hyssop if olium 117 



Fig. 74. — Beach Pea, Lathyrus maritimus 117 



Fig. 75. — Cinqueioil, Potentilla Anserina 117 



Fig. 76. — Wormwood, Arlemis la caudata 117 



Fig. 77. — Rye Grass, Elymus canadensis 117 



Fig. 78. — Winged Pigweed, Cycloloma atriplicijolium . . . .117 



Fig. 79. — Green ^l\\k\NQed, A cerates viridiflor a 117 



Fig. 80. — Seaside Spurge, Euphorbia polygonifolia . . . .117 



Fig. 81. — Cocklehxxr, Xanthimn echinaium 118 



