J\ V I - 



L 



RECENT PROGRESS IN 

 THE STUDY OF VARIATION, 

 HEREDITY, AND EVOLUTION 



BY 



ROBERT HEATH LOCK, M.A., Sc.D. 



SOMETIME FELLOW OF GONV1LLH AND CAIUS COLLEGE, CAMBRIDGE J 



LATE ASSISTANT DIRECTOR OF THB ROYAL BOTANIC 



GARDENS, CEYLON 



REVISED BY 



LEONARD DONCASTER, Sc.D., F.R.S. 



PROFESSOR OF ZOOLOOY, UNIVERSITY OF LIVERPOOL 



BIOGRAPHICAL NOTE BY BELLA SIDNEY WOOLF 



(MRS. R. H. LOCK) 



LONDON 



JOHN MURRAY, ALBEMARLE STREET. W. 



1920 



