Water -connectivity in Sycamore Wood . 261 
shoot, Figs. 3, 7, io, and 11. The shape of Curve D in Sycamore is much 
more like that characteristic of Hazel than that of Ash stool shoots, where 
the wood is particularly poor in vessels. Considering only wood of the first 
year, the limits of variation in the width and distribution of these elements, 
among the measurements made for the three plants, may be compared 
as follows : 
Ash. 
Range in values of E in [x 2 7*85 to 10-14 
,, „ actual diameters in n 80 „ 3 
„ „ values for D 32 „ 633 
Sycamore. 
27.85 to 7 
60 „ 3 
137 » 22 33 
Hazel. 
23-27 to 4-9 
i4 8 » 2 
115 „ 4000 
The result is that the specific conductivity for the first-year Sycamore 
wood, as represented by Curve C, which gives the percentage of B in A, 
is near that for Hazel, both being higher than that for Ash : 
Ash. Sycamore. Hazel. 
Range in values of C, % 2.32 to 12-25 7 - l 9 to 2 °*93 4-°9 to 2 5*4 
It must be remembered that this shorter range of values for Sycamore 
as compared with Hazel has been obtained from shorter shoots, not 
altogether comparable with stool shoots. A particularly low specific con- 
ductivity at the base is characteristic of stool shoots, as mentioned by 
Farmer ( 5 , p. 241). It is apparent from Figs. 2, 8, 9, 11, and 12 that there 
is considerable variation in the shape of Curve C, as among the different 
specimens, though there is a tendency to a fairly close similarity in its shape 
