257 
Ash-wood with Reference to Water-conductivity. 
account in the investigation, and the figures from which the graphs were 
drawn refer to the wood developed in the first season only, so that these 
graphs can be compared fairly with those given for A 3, A4, and A 6, and 
also with those for the Hazel shoots, 1 H 7 to H 10. The wood cylinder for the 
first year is completely closed in all the sections cut from A 8, and is 
particularly wide between the cambium and the pith in internode 6 at the 
end of A 8 a. 
Fig. 2. The numbers refer to the internodes on each 
shoot respectively. 
Fig. 3. The numbers refer to inter- 
nodes, reckoned from the base of the 
shoot. 
The water-conducting elements in Ash-wood are all vessels ; there are 
no tracheides. The vessels are scattered among wood fibres, and are 
especially associated with wood parenchyma in vertical strands, the latter 
being most abundant near the autumnal limit of the cylinder. 
The wood is crossed by numerous medullary rays, one or two cells 
wide, and often many cells deep. The vessels are mostly round or elliptical 
in transverse section, and have numerous bordered pits in their walls ; they 
1 Holmes, M. G. : loc. cit. 
