58 



Scientific Proceedings, Royal Dublin Society. 



towards the upper end of the stem. Unlike Acer, Ulmus possesses noticeable 

 quantities of reducing sugars. From inspection of the phenylosazones it was 

 seen that in the lowest portion maltose and hexoses were present in roughly 

 equal quantities. At the 16-metre level the hexoses were in slight excess, 

 and this excess became greater in the highest portion. 



Sub- Evergreens. 



Two similar specimens of Cotoneaster, grown in a very sheltered, over- 

 shadowed position, were examined in February and June, from the root up 

 to the 6-metre level. In addition two others were examined in October and 

 December, but in these latter measurements on the intervening tracts of the 

 stem were not made. 



Table VII. 



Cotoneaster frigida, osmotic pressure in atmospheres. 



Root 



Stem 6 m. level. 



Oct. 1914. Dec. 1914. 



Feb. 9th, 1915. 



078 

 1-04 



0-48 

 0-64 



0-63 

 0-64 



June 21st, 1915. 



1-34 

 0-76 



From these it is seen that the pressures are higher in October and in 

 June than in the winter or spring, for in evergreens there is no marked 

 mobilization of reserves in the spring. The values of the conductivity, etc., 

 for the 1914 experiments have been published already (1). Below are given 

 the full set of measurements for the two 1915 experiments. 



Table VIII. 

 Cotoneaster frigida, February 9th, 1915. 



