viii Contents. 



fAOE 



APPENDIX B. AN EXAMINATION BY MR. FLETCHER 

 MOULTON OF MR. WALLACE'S CALCULATION TOUCH- 

 ING THE POSSIBILITY OF PHYSIOLOGICAL SELECTION 

 EVER ACTING ALONE 1 57 



APPENDIX C. SOME EXTRACTS FROM THE AUTHOR'S 

 NOTE-BOOKS 169 



