GONTENTS ix 
CHAPTER PAGE 
XIV. ToautopHytes (continued) .....4.-. ae . 336 
Myxomycetes and Bacteria (Thallophytes lacking food- 
making pigments) PF ate _ sit Ue atey te be go eae a 336 
Myxomycetes (Slime Molds)... .......... 336 
Bacteriae: 9 a a SS BS BS 341 
XV. Tuatiopuytes (concluded) , eimai tae A? coe (3 351 
Fungi (Thallophytes lacking food-making pigments) 351 
Phycomycetes (Alga-like Fungi) 353 
Ascomycetes (Sac Fungi) and Lichens 363 
Basidiomycetes . ee 8 . 382 
Fungi Imperfecti (Imperfect Fungi) = 8 ..... 404 
XVI. Bryroppytes (Moss Piants) is ‘ ae ae 405 
Liverworts and Mosses : fe ae eae 405 
Liverworts : 5336 ; » ... 406 
Mosses. ar ‘i : 417 
XVII. Prermporpytes (FERN PLants) eee eg 425 
Filicales : a é A Og oY Baas 426 
Equisetales (Horsetails) . . . ee Se dowe toe 435 
Lycopodiales (Club Mosses) . ........ 2.224 438 
XVIII. Spermatophytes (Seed Plants) BS of. Bie co Or Sr dien G eG 445 
Gymnosperms (Seeds not enclosed) = 8 ....... 445 
Cycads (Cyeadales).  . . 3 ot hes 446 
Pines (Pinaceae) ... . a 2 ea 451 
XIX. Spermatophytes (continued) ...... : P 459 
Angiosperms (seeds enclosed) 459 
XX. CLassIFICATION or ANGIOSPERMS AND Some or THEIR Fami- 
ties or Most Economic IMPorTANCE . , wae 471 
Dicotyledons (Apetalae) . a ; . 473 
Dicotyledons (Polypetalae) .... 3 ..... 481 
Dicotyledons (Sympetalae). . ..... be cig - . 489 
Monocotyledons .  ... 2... ee eee ee ee ee 495 
XXI. Ecological classification of plants  ........-++. 500 
Nature of Meology: 5 6 wis 40 Se a ee ee es 500 
Heologiealfactors: ose Sees, geo a ok er kA ae ee 501 
Ecological societies . 2. 2... 1. ee ee ee te 504 
Plantyswecession. 2 .4.0a Boe BOR Soe aw We al GEG 510 
XXII. Evotution ..... : Se, oda el ates Se Gla ae eS 513 
Meaning and Theories of Evolution .......-.-. 513 
Experimental Evolution . . a> Bay Paar siay ome Seay eared ork 524 
XXIII. Heredity . xe Se asthe. fie Se ee ie Se 535 
General features of Heredity .............. 535 
Experimental study of Heredity ...........-.- 537 
