TRANSACTIONS • 



OF THE 



ROYAL 

 SCOmSH ARBORICULTURAL SOCIETY, 



A. W. BORTHWICK, D.Sc, 



HONORARY EDITOR, 



ROBERT GALLOWAY, S.S.C, 



SECRETARY AND TREASURER. 



VOL. XXXV. 



EDINBURGH: 

 • PRINTED FOR THE SOCIETY. 

 SOLD BY DOUGLAS <k FOULIS, CASTLE STREET. 



1921. 



[LIBRARY NEW YORK BOTANICAL GARDEN 



