Vol. XXIIL November, 1912. No. 6 BIOLOGICAL BULLETIN ECOLOGICAL SUCCESSION. 1 V. ASPECTS OF PHYSIOLOGICAL CLASSIFICATION. VICTOR E. SHELFORD. CONTENTS. I. Introduction 331 II. Basis and Method of Classification 335 1 . Basis 335 2. Ecological Specificity and Specificity of Behavior 337 3. Stratification or Vertical Aspects 339 4. Habitat or Horizontal Aspects 343 (a) Dynamic Relations of Local and Climatic Conditions 344 5. Primary and Secondary Conditions and Communities 349 6. Development of Ecological Classification 352 7. Ecological Terminology 354 8. Animal Communities in the Forest Border Region 357 III. General Discussion 359 IV. Summary 366 V. Acknowledgments and Bibliography 366 I. INTRODUCTION. Every investigator appreciates the value of having several methods of organizing data on a given subject. Each new arrangement adds new light and often valuable conclusions. 1 The following errata appeared in the preceding paper, " Ecological Succession IV.," Vol. XXIIL, pp. 59 to 99 of this journal: Page 66, Table I.: for Lee. read Dj.; for Psinida read Psinidia; for americanorum read americanus; for wyominganum read wyomingianum; for Cnemodophorus read Cnemidophorus. Page 67, for arborens read arboreus Say; for Cyclisticus read Cylisticus; for Lyasopetalum read Lysiopelalum; for Spirobolis read Spirobolus; for promelia read pimelia; for Liobromum nigripalpi read Liobunum nigropalpi Wood; for htrtculeanus read herculeanus ; for Cerchus read Ceruchus. Page 68, for melumboni read nelumbonis; for Ampulicidce read Ceropalidce; for Psilhurus read Psithyrus; for anornis read anormis; for umbratis read umbratus; opposite species 19 and 20, for H read /. 331
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