CONTENTS xiii 



CHAPTER PAGE 



XV. GENERAL DISCUSSION ' . . . 299 



I. Introduction 299 



II. Application of the Laws Governing Animal Activities to 



World and Regional Problems 299 



III. Agreement between Plants and Animals 304 



IV. Relations of Communities 308 



V. General Relation of Communities of the Same Climate . 311 



VI. Relations of Ecology to Other Biological Subjects . . . 315 



VII. Relations of Ecology to Geography 318 



APPENDIX: Methods of Study 321 



BIBLIOGRAPHY , 325 



INDEX OF AUTHORS AND COLLABORATORS 339 



INDEX OF SUBJECTS 343 



