Vlll PREFACE 



I wish to express thanks for kind help on different 

 points : to Professor Henry Jones of Glasgow Uni- 

 versity; to the Rev. A. Halliday Douglas, Cam- 

 bridge ; and, among others, very special thanks to 

 Professor J. Arthur Thomson and Mr. Norman 

 Wyld. Both Mr. Thomson and Mr. Wyld, while 

 busy with important work on the theory of natural 

 selection, found time to give an amateur valuable 

 information bearing on the meaning and merits of 

 Weismann's doctrine of Panmixia. 



R. M. 



