TABLE OF CONTENTS. XV 



PAGES 



Topic IX : Dicotyledones with united petals, flower parts 



IS FOUR WHORLS 275-27^ 



Order Tubiflorse : Family Labiatse ; the mint family. 



Order Personate : Family Scrophulariacese; thefigwort family. 



CHAPTER XLVI. 



Topic IX, continued 278-282 



Order Aggregatae : Family Compositae ; the composite family. 



PART III: ECOLOGY. 



Introduction 283-291 



Suggestions for ecological study. 



CHAPTER XLVII. 

 Seed distribution 292-299 



CHAPTER XLVIII. 

 Struggle for occupation of land 300-305 



CHAPTER XLIX. 

 Zonal distribution of plants 306-310 



CHAPTER L. 

 Soil formation in rocky regions and in moors 311-327 



CHAPTER LI. 

 Plant communities ; seasonal changes 328-336 



CHAPTER LII. 

 Adaptation of plants to climate 337-341 



APPENDIX 343-353 



GLOSSARY 3S5-36o 



