CONTENTS. 



PART IV : ECOLOGY. 



PAGE 



CHAPTER XIX. FORMS OF VEGETATION 308 



XX. MESOPHYTES 312 



XXI. XEROPHYTES AND HALOPHYTES . . . 318 



XXII. HYDROPHYTES 327 



XXIII. ADAPTATIONS TO OTHER PLANTS AS SUPPORTS 330 



XXIV. SYMBIOSIS. . 333 



XXV. ANIMALS AS FOOD, FOES, OR FRIENDS . . 342 



XXVI. PROTECTION AND DISTRIBUTION OF SPORES 



AND SEEDS ....... 352 



APPENDIX I. DIRECTIONS FOR LABORATORY STUDY . . . 369 

 II. DIRECTIONS FOR COLLECTING AND PRESERVING 



MATERIAL ........ 40! 



III. APPARATUS AND REAGENTS 409 



IV. REFERENCE BOOKS ...... 413 



V. OUTLINE OF CLASSIFICATION .... 415 



INDEX 419 



