60 



Scientific Proceedings, Royal Dublin Society. 



Evergreens. 



A specimen of Arbutus was examined in December, the root, stem, and 

 leaves being all tested. The high sugar content of the root is noticeable. 

 Comparison of the transpiration sap with that from the leaf tissues pressed 

 after treatment with liquid air shows how relatively enormous are the 

 concentrations of both sugars and electrolytes in the latter. The values are 

 given in Table X. 



Table X. 

 Arbutus unedo, December 11th. 



Two specimens of Ilex were cut down, one in the end of January after a 

 fall of snow, and the other in March. As in Cotoneaster and Arbutus, the 

 conductivity of the sap is low. Again, the sugar content of the root is high. 

 Moreover in Ilex reducing sugars are of importance throughout the whole of 

 the conducting tracts, and are present in greater quantities than sucrose 

 in all levels above that of the ground. The results are shown in Tables XI 

 and XII. As in other evergreens, no vernal mobilization of reserves is to 

 be found. The top of the stem may have a higher osmotic pressure than the 

 lower portions and root, though in one case (as in Arbutus) that of the root 

 was slightly greater than that of the stem. 



