xii CONTENTS. 



Indiscriminate Separation, etc., a Cause of Divergence Continued. 



Facts Proving This 252 



Cessation of Reflexive Selection Between Isolated Sections Causes 



Divergence as Soon as Heredity Weakens 254 



Utility of Specific Characters 255-261 



Right-handedness, Left-handedness, and Similar Differences 256 



Difference in Use not Necessarily Useful Difference 258 



Divergence Due to Different Methods of Reflexive Selection Often 



Non-advantageous 259 



Different Methods of Using the Same Environment 259 



Letter by Mr. Cockerell, with Suggestions on the Facts Mentioned . . 260 



Reply to Same 261 



APPENDIX IV. LIST OF PAPERS ON EVOLUTION, BY JOHN T. GUUCK. 262 



