xvi Contents 



PAGE 



APPENDIX A. Original Statements of Organic Selection and Ortho- 



plasy: by H. F. Osborn, C. Lloyd Morgan, and E. B. Poulton . 335 



APPENDIX B. Other Expositions of Organic Selection and Orthoplasy : 



by F. W. Headley and H. \V. Conn 353 



APPENDIX C. Recent Biology ........ 372 



INDEX 393 



