^1 



JOURNAL OF GENETICS 



II' 



EDITED BY 



W. BATESON, M.A., F.R.S. 



DIRECTOR OF THE JOHN INNES HORTICULTURAL INSTITUTION ' 



AND 



R. C. PUNNETT, M.A., F.R.S. 



ARTHUR BALFOUR PROFESSOR OF GENETICS IN THE UNIVERSITY OF CAMBRIDGE 



Volume IX. 1919-1920 



Cambridge 



at the University Press 



1920 





