446 



Scientific Proceedings, Royal Dublin Society. 



non-electrolytes, which are mainly sugars. In this manner not only are the 

 osmotic pressures obtained, but also the parts played by carbohydrates and 

 electrolytes in producing the pressure are indicated. 



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



Syringa vulgaris.— Leaves. 



Fig. 1. 



Syringa vidgaris.' 

 Tlie leaves of S. vulgaris formed the first subject of investigation. The 

 results of the experiments are displayed in Table I. The leaves of tliree 

 individuals were investigated — one in an exposed position in Trinity College 



