THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Yol. XIII. (N.S.), lo. 18. APRIL, 1912. 



YAEIATIONS IN THE OSMOTIC PRESSUEE OF 

 THE SAP OF ILEX AQUIFOLIUM. 



BY 



HENRY H. DIXON, ScD., F.R.S., 



UNIVERSITY PEOFESSOE OF BOTANY, TEINITY COLLEGE, DUBLIN, 



AND 



W. R. G. ATKINS, M.A., A.I.C., 



ASSISTANT TO THE PKOFBSSOE OF BOTANY, TEINITY COLLEGE, DUBLIN. 



[i4 uihors alone are responsible for all opinions expressed in theirOommunicafions.'] 



DUBLIN: 



PUBLISHED BY THE ROYAL DUBLIN SOCIETY, 

 LEINSTER HOUSE, DUBLIN. 

 WILLIAMS AND NORGATE, 

 14, HENRIETTA STREET, COVENT GARDEN, LONDON, W.C. , _,j,^[ ^ 



1912. 



Price Sixpence. 



