LIST OK ILLUSTRATIONS 



FULL-PAGE PLATKS. 



Plate I. Pinncie of Dryopteris cristataxmarginalis. 



II. The Torch Tree [Foiiqiiicriacoliii/inaris). 



III. A Forest of the Carboniferous Age. 



IV. Old Lake, Hamilton County, Iowa. 



V. Porella platyphylla. 



VI. Fossil Wood. 



VII. The Washington Elm. 



VIII. Alvin Wentworth Chapman. 



IX. The Liberty Tree of Annapolis, Md. 







FIGURES IN THE TEXT. 



PAGE. 



Fossil Leaf 8 



Growth of Asparagus Stems 28 



Fairy-ring in Grounds of U. S. Department of Agriculture. . . 39 



Fairy-ring Mushroom ( Marasinius or cades) 40 



Plants Arranged in Botanical Press 93 



Press for Botanical Specimens 94 



Fossil Moss 108 



Arrangement of Plants in Herbarium Sheet 131 



Hemlock Blulf, Potomac River ^ 144 



Herbarium Labels 149, 150 



Peculiarities of Purslane 165 



Development of the Field Horse-tail 196, 197 



INDKX O^ AUTHORS. 



PAGE. 



Arthur, J. C 41 



Baker, C. F 29 



Ball, Carleton R 88 



Barbour, William C 155 



Barhes, Charles R 140 



Bates, Edith M 35 



Bates, James A . 138 



Beal, W. J 155 



Bessey, Charles E 51, 190 



Bethel, Ellsworth 154, 199 



