260 Holmes . — Observations on the Anatomy of 
stool shoots of the Ash the internodes are longer and fewer than in the 
Hazel stool shoots, and also each bears two leaves. 
The total or absolute conductivity for water is represented, for purposes 
of comparison in this inquiry, by the area in square millimetres of all 
the vessels in each transverse section of the wood, taken at the middle 
points of the selected internodes. This is shown in curve B,and is obtained 
Fig. 6. 
by calculation from curves F and E ; it depends upon the total area of the 
wood, given in curve A, as well as upon its specific quality. 
Curve A , giving the variation in area of the wood along each shoot, 
shows in general a very regular descent, rather steeper at the base ; this is 
especially the case in the larger shoots, in which considerable support is 
necessary. 
Curve F gives the total number of vessels present in the transverse 
section at the different levels in each shoot. It shows a fairly steady decline 
from base to apex ; in A 8 b the decline is particularly steep. 
o m 
