532 Rivet t . — The Anatomy of Rhododendron ponticum, Z., and of 
which exert a modifying influence on the analysis of the wood in sectors — 
that is to say, a sector through one of these groups must be combined with 
sectors on different radii, in order to obtain a true average view of the 
wood-constituents in those particular sections. The first-year wood in 
each annual shoot forms a cone, and the constituents of the narrow apex 
differ considerably from those of the wide base (see Diagram III). The 
HOLLY. 
Longitudinal Section. 
Shoot G 
Diagram III. To show comparative uniformity of outer rings of wood as compared with the 
first ring in each yearly segment. 
second annual ring contains larger water-conducting elements than the first, 
those formed in the spring zone containing some of the widest individual 
elements to be seen. They are arranged more or less in radial rows or 
groups, with intervening radial patches of fibres. The third-, fourth-, and 
fifth-year woods are all very similar on a general inspection of transverse 
sections, showing wide water-conducting elements and patches of fibres. 
Owing to their similarity at different levels in the stem, they modify the 
general average analysis of old shoots to a considerable extent, and partially 
eliminate the variations noticed in the cone of the first-year wood. In July, 
when the wood was cut, cambial activity is still in progress and the 
