458 



Scientific Proceedings, Royal Dublin Society. 



The eoneentration of the electrolytes also was similai: to that of Ilex, and 

 except for a very remarkable rise in May remained approximately uniform 

 throughout the year. The two observations — on the specimen from the 

 north and from the south aspect— made in May indicate an extraordinary 



NOV. DEC. JAN. FEB. MAR. APRIL MAY JUNE JULY AUG. SEPT. OCT^ NOV. 



HeDERA helix - Mature leaves. N, aspect, 

 FiQ. 4. 



rise in the concentration of the electrolytes. No external conditions were 

 observed to account for this rise, but at tlie same time the measurements 

 were quite unequivocal, and so the observations are recorded while no 

 explanation can as yet be offered. 



