THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Vol. XV. (I.S.), lo. 6. MAEGH, 1916. 



OSMOTIC PRESSURES IN PLANTS. 



VI. — On the Composition of the Sap in the Conducting 

 Tracts of Teees at Different Levels and at 

 Different Seasons of the Year. 



BY 



HENRY H. DIXON, Sc.D. (Dubl.), F.R.S., 



UNIVERSITY PROFESSOR OF BOTANY, TRINITY COLLEGE, DUBLIN ; 



AND 



W. R. G. ATKINS, Sc.D. (Dubl.), F.I.C., 



ASSISTANT TO THE UNIVERSITY PROFESSOR OF BOTANY, TRINITY COLLEGE, DUBLIN. 



[A uthors alone are responsible for all opinions expressed in their Communications-] 



DUBLIN : 



PUBLISHED BY THE ROYAL DUBLIN SOCIETY, 



LEINSTER HOUSE, DUBLIN. 

 WILLIAMS AND NORGATE, 



14, HENRIETTA STREET, COVENT GARDEN, LONDON, W.C. 



Price Sixpence. \^ 



