xvi CONTENTS. 



CHAPTER XXI. 



PACK 



MR. DARWIN'S DEFENCE OP THE EXPRESSION, NATURAL SELEC- 

 TION PROFESSOR MIVART AND NATURAL SELECTION .. 3G2 



CHAPTEE XXII. 



THE CASE OF THE MADEIRA BEETLES AS ILLUSTRATING THE 

 DIFFERENCE BETWEEN THE EVOLUTION OF LAMARCK AND 

 OF MR. CHARLES DARWIN CONCLUSION 373 



APPENDIX.. 385 



INDEX.. 409 



