456 



Scientific Proceedings, Royal Dublin Society. 



Hedera helix, leaves. 



The next object of study was the evergreen Hedera helix. Two specimens 

 were investigated concurrently ; one from a northern and one from a southern 

 aspect. Both grew trailing upon the ground ; that from the north aspect 

 was close under the north side of a building, and never received direct sun- 

 light ; the other was situated under high trees, which rendered the ground it 

 grew in comparatively dry, but did not cut off the sunshine. The latter 

 position was open to the sun almost as long as it was above the horizon. 



The results of the cryoscopio and conductivity measurements on these 

 two are recorded in Tables Y and VI. From these the graphs given in 

 figs. 4 and 5 are plotted. 



Table V. 

 Hedera helix : Leaves from nurth aspect. 



