CHAPTER VI.

A BRIEF HISTORY OF ISOLATION AS A FACTOR IN ORGANIC EVOLUTION 101

GENERAL CONCLUSIONS 144

APPENDIX A. MR. GULICK'S CRITICISM OF MR. WALLACE'S VIEWS ON PHYSIOLOGICAL SELECTION 151

APPENDIX B. AN EXAMINATION BY MR. FLETCHER MOULTON OF MR. WALLACE'S CALCULATION TOUCHING THE POSSIBILITY OF PHYSIOLOGICAL SELECTION EVER ACTING ALONE 157

APPENDIX C. SOME EXTRACTS FROM THE AUTHOR'S NOTE-BOOKS 169

_ISOLATION_