viii Contents. 



MM 



APPENDIX B. AN EXAMINATION BY MR. FLETCHER 

 MOULTON OF MR. WALLACE'S CALCULATION TOUCH- 

 ING THE POSSIBILITY OF PHYSIOLOGICAL SELECTION 

 EVER ACTING ALONE 157 



APPENDIX C. SOME EXTRACTS FROM THE AUTHOR'S 

 NOTE-BOOKS . . . . . . . . 169 



