53 & Rivet t, — The Anatomy of R h ododendro n p onticu m , T., and of 
slightly, but the more numerous water-conducting elements in its middle 
region causes the curve to be slightly rounded : this is even more marked 
in the three-year-old segment, where the wood-area decrease is slight and 
the water-conducting elements are very numerous in the middle region. 
In the two-year-old segment the wood-area decrease is again steeper, but 
o 
Diagram VII. Internodes numbered from 
base to apex. (Scale, 5 internodes = 1 cm.) 
Diagram VIII. Internodes numbered from base to 
apex. (Scale, 5 internodes = 1 cm.) 
the change in the number of conducting elements still causes the curve to 
be rounded. In the one-year-old segment there is only a general decrease 
and no rounding of the curve, consequent on the decreasing size of the 
elements and the decrease in wood-area. In Shoot L, which was a rapidly 
growing, well-favoured specimen, there is a marked fall of the curve at the 
end of the three-year-old segment, but the rest of its descent is gradual. 
